PVR: add re-implemented pvrsrvinit and glue

as the proprietary pvrsrvctl is non-PIE, add a re-implementation
of it.

Original implementation:
https://github.com/stargo/android_device_motorola_omap4-common/commit/a2afd02f3cf0209d3d21a4535f747d724078e8bd

Modified for i9500

Change-Id: I1842738e223b2ac302ef19ae6731ad0b492ade4d
libcorkscrew: add stub-implementation to make gralloc happy

Change-Id: I4ed573bcac7e8d7b14292b928ddb9c018b70bae3