p4-common: update fstab files for 4.3

Change-Id: I48ca5e60a634fef7261c29e4e4ca31471e3b569e
p4-common: set TARGET_CPU_VARIANT to tegra2

Depends on http://review.cyanogenmod.org/#/c/46725

Change-Id: I5d6b1ee0f52b614bb79946395d4657f79f57dd44