[EGD-6214] Add slider position reading after disabling tethering

To be able to set proper phone mode changed by the slider during
tethering, the forced readout of slider position has been added

[EGD-6416] Add handling of headset keys

Change the volume level using headset keys

[EGD-5748] Revert remake cellular flow

Reverts changes due to reported issues

[EGD-6425] Update USB submodule version

Restored USB submodule version to HEAD

[EGD-5443] Onboarding date and time window

Add posibility to override bottom bar in Date and Time settings window.
Change primiary action to save in OnBoardingDateAndTimeWindow
Back to previous window after settings date/time in onboarding flow

[EGD-6156] Create crash dumps

Integrate the CrashCatcher library in order to store phone state after
a fault occurs. The dumps are stored in the CrashCatcher hex format and
can be debugged using the CrashDebug stub built for x86_64 via the
'debug_crash_dump.sh' script.

[EGD-6383] Add HW initialization for headset keys detection

Replaced timer-based hander with IRQ handler to get
  headset status

Added initialization for headset key press detection

[EGD-5748] Remake Cellular flow

This commit changes TS0710 Worker operation.
1. It introduces MessageBuffers as main
interprocess data passing mechanism.
2. DMA transaction status codes and CMUX errors
are now propagated to Service.
3. Data processing has been refactored.

[EGD-6113] Fix Test harness issue in ServiceDesktop worker

Remove spare logging in MessageHandler.cpp
Move Linux CI target to Release
Remove spare logs form harness tests
Disable failing test cases in:
test_templates and test_connection_security

[EGD-6309] Fix 2-sec delay in VCom deinit when USB cable disconnected

When USB wasn't attached, MTP task waits for configured event,
hence it cannot be joined before semaphore take times out (2 sec).

[EGD-6321] Fix max usb current

Setting proper value of
max USB current

[EGD-4863] Add harness test for cellular sleep mode

Adding test for outgoing call and text message
in cellular sleep mode

[EGD-4852] Add sleep mode for GSM modem

When the GSM modem is idle and there is no communication,
it enters the sleep mode, where the power consumption
is significantly reduced.

[EGD-6239] Fix Linux Release build on gcc-10

strncpy() was provided with size equal to a buffer size, not leaving
buffer space for a trailing zero; also sml fix.

[EGD-5868] Add access to backup over MTP

This change adds access to backups via MTP
after backup file has been successfuly created.

[EGD-6190] Fix Bluetooth DMA transmission

Enabled previously FIFO buffer without proper handling caused
ignoring one byte. Disabling FIFO fixes this issue

[EGD-6111] Timers refactored

Deep refactor of system timers.

[EGD-5814] Fix battery revert

Revert of temporary fix
for old battery operation

[EGD-6237] Add memory clearing of MTP database storage

Clear allocated memory to avoid occasional HFs due to accessing
trashed entries

[EGD-6192] Add torch hw control v2

Change behavior of torch
control according to newest
design.