gfx-gtt: enhanced GTT memory manager to support different buffer types.

gfx-gtt: enhanced GTT memory manager to support different buffer types.

This is patch 2/5 of HWC enabling.

Added three interfaces to GTT memory manager to support follow buffers:
1) all kinds of PVR meminfo
2) BCD buffer
3) user mode allocated buffer.

Change-Id: I9bdcd4f18cf01ab58976c495d51b0aa0a3d27583
Signed-off-by: Jackie Li <yaodong.li@intel.com>
Reviewed-on: http://android.intel.com:8080/25090
Reviewed-by: buildbot <buildbot@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Tested-by: Gross, Mark <mark.gross@intel.com>