m7-common: upgrade fstab files for 4.3

Change-Id: If3b3458c3224dfb6da536e689e71e653ac959c5f
m7-common: use auto file type for external USB mount

Change-Id: Ica5db7a4eb80e2788581cdc86560de741cccb6e9
m7-common: update proprietary list to use mako adreno

Change-Id: I2e2a6ce4d66a8b9d6ef7f1c1554b3b9555cb4a08
m7-common: remove legacy CWM hack

Change-Id: I6b7ea9a6da979992a95d0e4db560327fd0c999de
m7-common: remove discard option

Change-Id: I33317a5f8bc302986137af4361c1eff43cd222cf