[BH-1673] Harmony random resets fixes

* Switching VDD_SOC_IN only after PLL2 is turned off.
* Weak LDO stabilization delay.
* Removed switching to 1.275V before frequency change.
* Cleanups in LDO switching.
* Removed switching PeriphClk2Div for fCPU <= 24MHz,
using AhbDiv instead.
* Removed log from _exit that caused logger mutex deadlock

[BH-1690] Add information about the connection to the PC

Added text with information about the connection to the main window
when the USB cable is connected to the PC

[MOS-686] Fixed MTP availability only after phone unlocked

Fixed file access via MTP even when phone is not unlocked.
Now access is granted when the phone is unlocked by the user entering
a passcode. If the phone is not passcode protected (passcode is nor set)
then access to the files is always possible via MTP.

[BH-1695] Fix Harmony crash on startup

Fix of the bug in PWM driver that
resulted in accessing array out of
bounds, what caused occasional
system crash on startup.

[BH-1595] USB reset procedure

* Fixed incorrect reset procedure
* Minor refactor

[CP-1966] Deleted file which is played does not stop the playback timer

Fixed the timer issue when file was deleted during playback.

[CP-1974] Deleting all templates leaves some text on pure screen

Additional fix, previous one was not working correctly in all scenarios.

[BH-1691] Change the layout of the battery status

The new layout of battery status has the battery
SOC on the left side and battery image on the right.

[BH-1693] Correct SDRAM timing settings according to chip RM

* Corrected SDRAM timings in T6 JLink script.
* Cleaned-up and commented JLink script.
* Bumped bootloader version.

[BH-1694] Increase CPU core voltage from 900mV to 975mV

Previous voltage setting was lower than the one
suggested in RT1051 RM and would lead to CPU
instability in certain conditions.

[MOS-975] Fixed missing new message notification

New message notificationis not cleared on locked phone
when phone was locked from thread window.

[MOS-578] Fix misleading SMS notification text

Display "New message", translated accordingly - in
singular - in case there had been multiple unread
SMS messages and now only one remains unread.

[CP-1974] Deleting all templates leaves some text on pure screen

Fixed Template window clearing after all templates are removed.

[BH-1583] Fix SNVS LP lockup after debugging

* Fix of the issue that manifested after
running MuditaOS on Harmony via JLink,
which resulted in OS freezing when
trying to set time in normally booted
(via the bootloader) device.
* Minor RTC code cleanup.
* Partial T6 JLink script cleanup.

[BH-1689] Turn off charging for CDP and SPD

Due to high current consumption the device
will be charging only for DCP mode and if the timeout
will occur.

[CP-1937] Amount of space assigned to "Other" changes after uploading audio file

Fixed by sending information about device memory in floats instead of
uints

[BH-1595] USB charger detection issues

* Fixed issues with USB charging port detection
* Fixed memory leak in usb_stack/OS integration layer
* Fixed incorrect handling of software timer
* Minor cleaning/refactor.

[BH-1595] Turned off USB/PC charging

Charging enabled only for a dedicated charger. Users won't be able
to charger while connected to the PC.

[CP-1950] Templates menu navigation loop and pagination on pure gets blocked

Fixed problem where the Templates window gets unresponsive for user input
while changes in templates were done via MC

[MOS-980] Match volume popup timeout with phone modes popup

As title describes.

[CP-1841] Distorted playback and poor device control responsiveness

Fixed problem with an unresponding device after playing specific WAV files.
WAV files encoded with ADPCM are not supported now by the devices.