Revert "display: Video Encoding not working"

This reverts commit 0a1db6aef28c3b90d1f992f56abc562dbae10b55.
Video encoder uses the NV12 encodeable format again.

Change-Id: I1b5170a5c2b5c7de0791cc5bc44457257519f749
diff --git a/libgralloc/gpu.cpp b/libgralloc/gpu.cpp
index eb19f89..f15a973 100644
--- a/libgralloc/gpu.cpp
+++ b/libgralloc/gpu.cpp
@@ -267,7 +267,7 @@
     //the usage bits, gralloc assigns a format.
     if(format == HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED) {
         if(usage & GRALLOC_USAGE_HW_VIDEO_ENCODER)
-            grallocFormat = HAL_PIXEL_FORMAT_YCbCr_420_SP_VENUS;
+            grallocFormat = HAL_PIXEL_FORMAT_NV12_ENCODEABLE; //NV12
         else if((usage & GRALLOC_USAGE_HW_CAMERA_MASK)
                 == GRALLOC_USAGE_HW_CAMERA_ZSL)
             grallocFormat = HAL_PIXEL_FORMAT_NV21_ZSL; //NV21 ZSL