this patch needs to be applied to system/vold manually
the patch disables support for FS_IOC_ADD_ENCRYPTION_KEY ioctl that
twrp probes and uses if available, but if twrp uses this with SODP
kernel 4.14 decryption fails at the end
this workaround makes twrp use the older api => decryption works
this patch is not needed for more common stock kernel based roms,
like the official Lineage OS for Sony Xperia XZ2 / XZ2c / XZ2p / XZ3
7a67f17a75