Add Linker Optimizations

* Make these optional as well as the Clang optimizations.
* Enable using OPTIMIZE_LINKER=y to BoardConfig of your device.

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
Change-Id: I984f428022a68a825aa041866e8d456bd6411f79
build: updater-script: Fix mount and format commands on F2FS

Change-Id: I3211fdf059eec5e95519faabb2b4a0968b2f69ee
Merge branch 'f2fs2' into kk