sdm: Add support for LINEAR_FORMAT metadata operation

1. Define LINEAR_FORMAT operation in MetaData.
2. VENUS ouput buffer is linear for NV12_UBWC Interlaced video playback.
   So Video module performs LINEAR_FORMAT operation to set "linearFormat"
   metadata member to NV12 linear format in case of Interlaced video.
3. Handle LINEAR_FORMAT metadata operation in HWC wrapper and gralloc.

CRs-Fixed: 855474

Change-Id: I77dd72bec26f225de75adb6c214ccd90db239e3e
diff --git a/libqdutils/qdMetaData.cpp b/libqdutils/qdMetaData.cpp
index aae0a47..2aa4a31 100644
--- a/libqdutils/qdMetaData.cpp
+++ b/libqdutils/qdMetaData.cpp
@@ -96,6 +96,9 @@
         case S3D_FORMAT:
             data->s3dFormat = *((uint32_t *)param);
             break;
+        case LINEAR_FORMAT:
+            data->linearFormat = *((uint32_t *)param);
+            break;
         default:
             ALOGE("Unknown paramType %d", paramType);
             break;