gralloc: Ignore IGC setting.

- Ignore IGC operation metadata setting so that sRGB content can
  be treated as regular RGB content.

CRs-Fixed: 958861

Change-Id: Ia66e9ef36c71ee834b4c1179f77e3be88218eec0
diff --git a/libgralloc/mapper.cpp b/libgralloc/mapper.cpp
index 421069f..142586b 100644
--- a/libgralloc/mapper.cpp
+++ b/libgralloc/mapper.cpp
@@ -467,18 +467,8 @@
             } break;
 
         case GRALLOC_MODULE_PERFORM_SET_IGC:
-            {
-                private_handle_t* hnd = va_arg(args, private_handle_t*);
-                uint32_t igc = va_arg(args, uint32_t);
-                if (!private_handle_t::validate(hnd)) {
-                    MetaData_t *metadata = (MetaData_t *)hnd->base_metadata;
-                    if (metadata) {
-                        metadata->igc = (IGC_t) igc;
-                        metadata->operation |= SET_IGC;
-                        res = 0;
-                    }
-                }
-            } break;
+            res = 0;
+            break;
 
         case GRALLOC_MODULE_PERFORM_SET_SINGLE_BUFFER_MODE:
             {