[EGD-5177] Change iosyscalls code style

This commit is part of libiosyscalls refining task.
Its purpose is to make this code more predictable and
easier to maintain (as well as fixing some minor bugs).

[EGD-5259] Fix littlefs format for block devices

Currently genlittlefs is unable to format block devices
currently it works only on the file images.
This patch resolves problem with bd format.

[EGD-5198] Fix service database tests

Due to the problems with settings api test there is need to turn it off
till it's fixed. Should be reverted as soon as it's done.

[EGD-5020] Add autodetect filesystem

Add support for autodetect filesystem in the fs core

[EGD-5199] Add support for mount umount

Add support for mount umount in the libiosyscall library
due to planning to use ro fatfs and remount to rw only
for update purposes.

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

[EGD-4498] Fix code after code review #1

Fixed some small minor issus in the RO mode in the vfs

[EGD-4498] Add unit test for remount RO

Add unit test for remount filesystem in ro mode
Some minor fixes

[EGD-4498] Fix vfscore-ut

Some paths are no longer available in the fat fs
this patch fix this issue.

[EGD-4498] Add support RO filesystem in the vfscore

Add support readonly filesystem mount flag
Add support for mount / remount

[EGD-4498] Add user functions for mount

Add user functions and methods for mount and unmount
capable with linux filesystem.

[EGD-5163] Fix UT module-db

Convert module database tests to run natively on linux.

[EGD-5137] Change iosyscalls symbols

Move iosyscalls symbols to a separate namespace `_iosys_*`

This helps us avoid accidentally overriding library calls
which are not exported as symbols.

[EGD-5182] Fix UT module vfs

Minor fixes to adjust vfs disk tests to the newer PurePhone image.

[EGD-5108] Fix UT module service

Convert module service tests to run natively on linux.

[EGD-5170] Fix native diropen

In the current implementation diropen is unable to listdir
in the native filesystem. This patch fix this issue.

[EGD-5165] Fix emulator crash on lfs and fat

Disk access was not protected by the mutex and race contition
occurs when multiple access was made for lfs and fat.

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

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5153] Fix errors in generate image script

Script for generate partitions for emulator by mistake
overwrites the littlefs image and fatfs image due to the
overlap fat parition and littlefs partition

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

[EGD-5145] Fix remove vfs include from UT

Deprecated vfs is no more accessible. Deleted old includes.

[EGD-5153] Fix disk manager sector_count

Currently when partition handle is passed to the disk manager
it returns total disk sector count instead of partitions sector count