[FEATURE] CUSTOMROM OmniROM Add exfat

[MartinX3]

exFAT specification did go open source
relan/exfat#132
docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification
cloudblogs.microsoft.com/opensource/2019/08/28/exfat-linux-kernel
lkml.org/lkml/2019/8/28/827

Means that exFAT will be part of the linux kernel -> becomes part of the android kernel -> gets into the SODP xperia kernel.

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FOLLOWING MAYBE NOW OBSOLETE:

Add relan/exfat
Check if fsck works.

https://github.com/relan/exfat/

Replace the old omnirom implementation
https://github.com/omnirom/android_external_exfat
Looks like an old version state of exfat.

Implementations:
SonyAOSP
https://github.com/SonyAosp/platform_manifest/blob/android-9.0/sonyaosp/aosp.xml#L20
SODP AOSP
https://github.com/sonyxperiadev/local_manifests/blob/2382083c7c19cf8da9a51618aeb064ebbe74f5aa/external.xml#L4

[MartinX3]

9.0 reached end of life.
Will be backported to kernel 4.14 which gets used in Android 10.0.