msm7x27-recovery: use RGBX_8888 for TWRP

Change-Id: I47056cee4e18b6cbe65dac9ab6af5b03c4c43b5e
Fix audio to speaker when headset is plugged

Change-Id: I8fa6ad67a9a9ae75218ac05df6bbcdbb512722fa
msm7x27-recovery: Set TW_EXCLUDE_MTP

Change-Id: Id5d61a8abfc17ffafa6f43347c43ed8c61ccc0e0
Set background app limit to 12

* For low memory devices, the original limit of 24 would be
  impractical anyways since it cannot contain that many apps.

(from CAF)

Allow more background services

* Some services or broadcast may get tremendous delay because
  of the limited background services. It will bring about many
  issues like alarmmanagerservice's wakelock held too long.

(from CAF)

Change-Id: Ibc679513c44810393f015afc7fb04fe2563dc413