hwc: updates for fence sync support

 * Renamed hwc.cpp to SecHWC.cpp
 * Removed BOARD_USE_V4L2_ION
 * Roll back API Version to V1.0
 * Pull in changes from hardware/samsung/exynos4/hal
 * Support for FENCE_SYNC

Change-Id: Iabbc9298d6ce46b1f2b24fd5ebcfac00c7b506c3
Merge "hwc: updates for fence sync support" into android-4.4