* flash_main.cpp: reorder code for easy integration of ext storage
* Add EFI_STORAGE_INT_FLASH option
Default set to TRUE
* Add ChibiOS's Managed Flash Storage to build
* Add support for QSPI flash (SST26F064A tested)
* board: subaru: enable WSPI and NOR flash drivers
* Add option to save settings on ext flash MFS partition
* board: subaru: store settings on QSPI NOR flash
Andrey G