[EGD-6576] Create EEPROM low level driver

Created low level driver for M24256 eeprom & dummy for linux.

[EGD-6651] Fix communication with modem on Linux

Fixed cellular bsp on Linux, so now emulator is able
to comunicate with modem. Fixed memory leak in CellularResult struct.

[EGD-5748] Remake Cellular flow

This commit remakes cellular data flow
introducing full error propagation.

[EGD-6457] Add power management for USB

When the USB is disconnected, we turn off the peripherals
by going into the suspend bus mode.

[EGD-6545] Enable magnetometer LPDCM mode

To be able to reduce the power usage of the phone, magnetometer
has been switched into interrupt driven LPDCM mode. Added some
fixups maintaining current behavior on startup and disabling
the tethering mode

[EGD-6506] Turn on function keys backlight during call

Backlight of function keys are on when call is active.
When call ends, previous backlight mode is restored.

[EGD-6515] Answer/reject calls using headset

Clean up propagation of headset keys events
Clean up volume control with headset keys
Update key mappings for simulator
Use headset OK key to answer/reject calls

[EGD-6505] Implement “On when active” Keypad light functionality

Implement “On when active” Keypad light functionality

[EGD-5360] Add USB current selection

Charging current selection algorithm
depending on USB type.

[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-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-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-5868] Add access to backup over MTP

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

[EGD-6111] Timers refactored

Deep refactor of system timers.

[EGD-6192] Add torch hw control v2

Change behavior of torch
control according to newest
design.

[EGD-5229] Cellular modem, change receiving to DMA

Changes implementation for receiving data from
cellular modem from IRQ byte-by-byte to DMA transactions.
Drop in replacement, works with current CMUX (TS07.10)