[EGD-7402] Cmake changes to download Updater

Right now we have updater as a fixed binary, we require
it downloaded as latest asset

[CP-305] Add sign update package in secure mode

Add signing package when the secure mode
is enabled

Signed-off-by: Lucjan Bryndza <lucjan.bryndza@mudita.com>

[BH-777] Add Bell specific ld script configuration

Added bell specific ld script configuration for
board memory layout

[BH-739] Split EventManager

Renaming:
- rename EventManager to EventManagerCommon,
- rename PureEventManager and BellEventManager
to EventManager

[BH-739] Split EventManager

Move `test-settings` to `PurePhone` product-specific directory

[BH-733] Cleanup target dependencies

Remove obsolete target dependencies across modules.
Remove 'cross' and 'unittests' targets.
Refactor some remaining target dependencies to use board include macro.

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

[BH-734] Add hardware board selection

To support bell hardware one needs to distinguish between the rt1051
generic target and product's boards.

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

[BH-736] Add image generation

Add image generation

[CP-427] Set Mudita USB VID as default

Use Mudita USB VID/PID as default.

[CP-282] Compute MD5 of the correct boot.bin file

The version file must store the checksum of the secured boot.bin file.

[CP-411] Add updater.bin to Update package

Packaging updater.{bin, ver} using embedded assets

[EGD-7267] Fix product reconfiguration

Product should be stored as a string, not boolean.

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

[CP-459] Add boot.bin version string to version.json

We want all versions stings to be handled in the same way.

[EGD-7032] Add product preconfiguration

Split build directories for each of a product.

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

[EGD-7031] Remove pureflash dep from disk img

The generated disk image does not require pureflash to be created.

[EGD-7227] Fix update package generation

Adjust paths in update image generation script to point to a new
sysroot.
Fix boot.bin file path to point to a new sysroot.

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

[EGD-7031] Remove UT deps to the production image

Remove dependency to the production image by creating separate sysroot
for test assets alongside with a test image Test.img.

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

[CP-282] Set correct standalone image dependencies

Fix a bug indroduced by removing cmake variables.

[CP-282] Add md5sums to the version.json file

Move checksums from a separate file to the version.json file.

[EGD-7088] SDRAM configuration on T7 board

Add configuration for new, increased to 64 MB SDRAM.