Fix jb-mr2 build

Test: buildbot stops complaining

Change-Id: I84de2fe6475308887b39aef4db4a8e965c732a34
diff --git a/system/gralloc/gralloc.cpp b/system/gralloc/gralloc.cpp
index 0c5a613..2b9dcc5 100644
--- a/system/gralloc/gralloc.cpp
+++ b/system/gralloc/gralloc.cpp
@@ -478,6 +478,7 @@
             glFormat = GL_RGB;
             glType = GL_UNSIGNED_SHORT_5_6_5;
             break;
+#if PLATFORM_SDK_VERSION >= 26
         case HAL_PIXEL_FORMAT_RGBA_FP16:
             bpp = 16;
             glFormat = GL_RGBA16F;
@@ -488,6 +489,7 @@
             glFormat = GL_RGBA;
             glType = GL_UNSIGNED_INT_10_10_10_2;
             break;
+#endif // PLATFORM_SDK_VERSION >= 26
 #if PLATFORM_SDK_VERSION >= 21
         case HAL_PIXEL_FORMAT_RAW16:
         case HAL_PIXEL_FORMAT_Y16: