i9500: 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 by @Frapeti
i9500: libcorkscrew: add stub-implementation to make gralloc happy