Add fp16 pixel and window formats

Bug: 32984164
Test: compile
Change-Id: I8303afbf857796295a280c0d9438a3c403a11437
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 20c0261..89f968f 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -1187,6 +1187,7 @@
     switch (format) {
         case HAL_PIXEL_FORMAT_RGBA_8888:
         case HAL_PIXEL_FORMAT_BGRA_8888:
+        case HAL_PIXEL_FORMAT_RGBA_FP16:
             return false;
     }
     // in all other case, we have no blending (also for unknown formats)