Change msm_rotator group to graphics
audio_policy: Allow a sample rate of 8 KHz only for VoIP output

Audio library allows only a sample rate of 8 KHz for VoIP output, when
a different sample rate is used, for example 16 KHz, the following
errors occur:
D/AudioHardware7x30(  156): AudioHardware::openOutputStream devices 1
    format 1 channels 1 samplerate 16000
...
E/AudioHardware7x30(156): AudioStreamOutDirect::set return bad values
E/AudioHardware7x30(156):
E/AudioHardware7x30(156): set Failed for AudioStreamOutDirect

After encountering these errors, some apps downgrade to a sample rate of
8 KHz while others stop working.

By removing the sample rate constraint on audio library, it's possible
to use a sample rate of 16 KHz with some apps like Hangouts and Viber,
but other apps like Skype and Line won't work properly anymore.
So it's better to keep the audio library as is and to use a sample rate
of 8 KHz only.
Revert "disable AAC encoder"

This reverts commit 4c7f7875b0339729a5b742bfe9597f8a441a14ff.
twrp: use model no.
Revert "remove zram"

This reverts commit 96fa0ca285be6247f51b19124e569f3d60997c8a.
Change zRAM configuration

Conflicts:

	system.prop
Cut zRAM size in half
fstab: sync with adc's, again
Revert "add back set__metadata for twrp test"

This reverts commit f4c90175d6d43ed0b1a1d9d39936614b5df00fbf.