[EGD-5014] Change MMC erase logic

MMC erase group size is 512 kB which would enforce
512 kB blocks on file system. Since for our purposes this
would be inefficient erase command has been disallowed.

[EGD-5334] Fix phone crash when MTP access

Fix phone crash when accessing file when new filesystem is used

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5297] Fix Release build on linux

Some minor warnings were preventing us from completing
Release build of Linux emulator.

[EGD-5332] Fix heap size and other merge fixes

After merge with master we are unable to run any application
It was caused by the insufficent heap size

[EGD-5737] Merge master into experimental

Keep experimental up to date with changes from master

[EGD-5289] Fix VFS folder mapping in emulator

Folder filtering prevented us from accessing /sys folder
of VFS image. This fix redirects all /sys references to
the image by default, requiring us to explicitly specify
all paths we want to redirect to Linux fs.

[EGD-5303] Add dev script for LFS part

Add flash script for flashing phone with new littlefs partition
and restore to the old parition scheme.
There are only transient scripts for pre-release.

[EGD-5248] Add statvfs to the libiosyscall library

Added support for statvfs in the libiosyscall library.
It is needed in service desktop implementation.

[EGD-5014] Fix global FS locks

Global locks are redundant and lower the performance.

[EGD-5014] Add eMMC block device API

Add PureOS wrapper for eMMC driver with support
for basic block device operations.

[EGD-5286] Fix run renderer before preload

Run service renderer before preload

[EGD-5139] Add some missing POSIX calls

This commit adds interceptions for common POSIX calls.
Issue [EGD-4551] has shown that some calls can be made from
stdlibc++ that we didn't trace or intercept so far. Our goal
here is to improve our POSIX coverage.

[EGD-4551] Add missing read() interception

Fix error caused by libstdc++ passing our fd to native read()

[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