build: updater-script: Fix mount and format commands on F2FS

Change-Id: I3211fdf059eec5e95519faabb2b4a0968b2f69ee
bootzip: ensure symlink is created in the right directory

Change-Id: I20a41c0da29d2cb6ec842627189577954018655c
Merge branch 'kitkat' of https://github.com/LiquidSmooth/android_build into ls-nozomi