serrano: Remove AGPS_USE_PSC

Change-Id: I59a652d99ca07700a31786f516f789c79bfd3481
serrano: Remove redundant settings

 * These are already the defaults
 * Also set critical battery warning to 5%

Change-Id: I898846a4ce9663372382d229a2e8f9ac22e48e15
Merge branch 'cm-11.0' into kk_mkt