Suppress -Wimplicit-fallthrough.

-Wimplicit-fallthrough will be enabled globally.

Test: build with global -Wimplicit-fallthrough.
Change-Id: Iac9b5dab643ab3db8b5c7d6c7260132f0a80a22e
diff --git a/vda/Android.bp b/vda/Android.bp
index 5f84535..adba0ef 100644
--- a/vda/Android.bp
+++ b/vda/Android.bp
@@ -36,6 +36,7 @@
         "-Wall",
         "-Werror",
         "-Wno-unused-parameter",
+        "-Wno-implicit-fallthrough", // at h264_decoder.cc:1374
     ],
     clang: true,
     sanitize: {