Camera: Support obtaining camera memory from MemoryHeapIon

* Exynos 5 devices want the ION file descriptor from MemoryHeapIon

Change-Id: I9e445cf24c15713f713181667e7b7caa1a96592e
Revert "Avoid jumps to faulty position after seeks"

This reverts commit 2bb4160f700470cfbcecf907d0a883b2a1058644, let's
see if this is what's actually causing the seek loops in streaming
video...
camera: Fix preview on SEMC msm7x30 devices

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I79039636ae188131b491c90cfe7894ff32d8ef2a