hwc: FPS property to show compositor performance

Use setprop debug.hwc.showfps 1 to show the average frames per second
displayed over the last 8 compositions.

debug.hwc.showfps can be set dynamically, the overhead of accessing Android
properties should be minor i.e. an access to an mmap'd() file, so this
should not be a significant overhead to composition when disabled.

Reworked from p-ics-mr1:
9ea53ce HWC: debug.hwc.showfps Android property shows current FPS
66a531d hwc: enable debug.hwc.showfps to be set dynamically

Change-Id: Ie2303e6ae9e73f38cf563d6ed6079928054e4c16
Signed-off-by: Tony Lofthouse <a0741364@ti.com>
(cherry picked from commit 69400d18d6cfc7b2b55b5a563b1fd4387887ded4)
hwc: Remove duplicated FBIO_WAITFORVSYNC definition
Add one more size for Front camera, otherwise the app will NPE
Update BT network interface name for Android 4.2

Change-Id: Id90d02e5707872a6a02400d60783e3647ad10a77
Copy Superuser init file to root for non embedded device

Without this file, su daemon won't start on non embedded devices.
Revert "Revert "set CPU_VARIANT to contex-a8""

This reverts commit 77de71986ded69e33d3b3783f83c5f8c5fb88867.
fstab: try noauto_da_alloc mount option
Provide libskia_legacy for compatibility with browser saved pages from Android 4.2 and earlier

Change-Id: I056bf470b0ba5872b8d00a87ee63b88e849c65f0