Add TARGET_USERIMAGES_USE_F2FS and BOARD_CACHEIMAGE_PARTITION_SIZE to soong_config_variable

`TARGET_USERIMAGES_USE_F2FS` and `BOARD_CACHEIMAGE_PARTITION_SIZE` are
used by `recovery_deps`. To convert `recovery_deps` to Android.bp,
these variables need to be added to soong_config_variable for Soong to
use.

Bug: 339143524
Test: m -j recovery_deps
Change-Id: I437a8287665c15a7c572b0d3177bef10633e13bf