exynos5-insignal: Add missing include path for sync/sync.h

Change-Id: Ic35c39049e46495d5bd79366e624dbfa3b2983f9 (reverted from commit f403ca4644171e584a1dfe18f98fdbdcbb066169)
hwc: set retire fence fds

Change-Id: Iece6483e6402a9a425086b8ee8e67e17909b7d8a (reverted from commit 93d1eee6888b6b354987a6c3fff8bc2061c9ba48)
exynos5-insignal: Add missing include path for sync/sync.h (2)

The previous commit only handled libhwcService, but libhwc needs
the sync definitions as well.

Change-Id: I95f01930a7aada0196744ed172db902a37c69283 (reverted from commit b9d9d836df42c809ecfce2475562477e3e835846)