s4-common: Create firmware symlinks at build time

Change-Id: I25af751f22ded9d438b304cbe079acef9f0ed930
s4-common: disable secure discard for ext4 wipes

Users are reporting really long wipe times in recovery on ext4
partitions.

Change-Id: I2f326622917266e9f43ea12da85889ca843008ca
s4-common: CameraWrapper: turn off face detect key

This fixes CYAN-4139.

Change-Id: I852edf0e6bdda3f6055320e6f8da414d35579174
s4-common: Don't assign garbage groups

Change-Id: Idbca017ef2eb2a2cf5fe85304f0d4591e09e4c09
s4-common: Remove unused init entries and scripts

Change-Id: I5e56d11186ff5524db9880004ddc361b99ad07bf
s4-common: Move directory creation to post-fs-data

Change-Id: I4d765af371b2ada5bbab16aa2e336637714b8863
Merge remote-tracking branch 'upstream/cm-11.0' into cm-11.0