geehrc: prepare for custom hotplug drivers (Kevin kang)

* remove power device specific bits (power.geehrc)
* disable mpdecision -> replaceage by auto_hotplug in kernel
* remove deprecated mpdecision touchboost flasg in BoardConfig.mk
update to LRX21T fingerprint and description

Change-Id: Ic522939d96324151bbe12d20755efea768c00607
Update framework overlays.

Change-Id: I5e609cd266a84165a083f5ad55eabc5b0e368d06
media: Enable ffmpeg decoders

Change-Id: I47c9b1aaf38cf78c47ad5512bd9df5cb63eb7b87
Replace libcyanogen-dsp in audio effects config.

Change-Id: I1b843110dce773c06f463ed7ebfc3b5d00c460e3