base: reduce config_backKillTimeout

2s are incredible long

Change-Id: I87aca38dfa941540d3a3a55cb0bc5a19e3b227ae
[2/2] Add lockscreen rotation as an optional rotation setting

Taken fom:

http://review.cyanogenmod.org/#/c/55016/

PS8
respect system config as default value

Change-Id: Icfd4344ffaf6987fe51b2a28df47593d9b3b3c0c
merge changes from Omni 4.4 into local branch