build: TWRP 3.1.1-x | blu_spark v8.54
Compatible with Nougat/Oreo zips
Improve automatic detection of QCOM RTC fix
Fix compile error in bootloader_message_twrp on 6.0 tree
Auto detect possible use of legacy props
Fix mkfs.f2fs build error
Fix 'No OS' on System_Image restore after wipe