[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

[EGD-5149] Fix temporary path

Currently temporary path is in the fat partition. This patch
changes the temporary directory to the LFS partition.

[EGD-5135] Add new lfs part scheme in emulator

Add new littlefs filesystem user partion in the fat database

[EGD-5075] Add new vfs core to new lib syscalls

Add new vfs core support to the new lib filesystem syscalls,
so currently new platform is switched to the new fs

[EGD-5102] Fix compile on rt1051 platform

It is initial commmit which fix compilation after
vfs. global object removal. It still need implementation
newlib syscalls.

[EGD-5102] Fix warning errors in the BSP

Fix warning errors in the BSP module

[EGD-5737] Merge with master

Keep experimental up to date with changes from master