[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)

[EGD-4853] Add Wake up GSM modem on demand

System wakes up Cellular when there is a need to communicate
with the modem, e.g. to handle an outgoing call

[EGD-5660] Add PWM Cpu sentinel

Change of PWM frequency due
to main clock change in low
power operation.

[EGD-5204] Show passcode screen only when PC is connected

USBConfigured event is not fired when powerbank, charger is connected.

[EGD-5204] Show passcode screen only when PC is connected

USBConfigured event is not fired when powerbank, charger is connected.

[EGD-5204] Secure USB communication

Secure all endpoints by returning 403(Forbidden) when USB is connected.
Request screen passcode to enable secured endpoints.

[EGD-5737] Merge master into experimental

Synchronize with master before merging

[EGD-5503] Add watchdog implementation

The system watchdog monitors whether there is message traffic
on the Bus. If no message was sent for an extended period of time,
a reset will occur. It should also protect against system-wide hangs.

On Linux, watchdog is simulated by a FreeRTOS task that will call exit
on timeout.

[EGD-3685] PR fixes

Included Alek's suggestions from PR

[EGD-3685] Added infinite repeat

Addef API for infinite vibra repeat

[EGD-3685] PR fixes

Fixes after PR suggestions

[EGD-3685] Vibra handling

Added driver & business logic. Responds to messages.

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5706] Refactor creating audio device

Audio devices are created in the audio subsystem and it is not possible
to send a device to bt service upon creation.

Introduce hookable audio device factory to allow sharing bluetooth
audio device. Move audio devices from bsp to audio allowing removal of
unwanted bsp -> audio dependency.

Remove Bluetooth proxy device which turned out to be a dead end.

Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>