transocding: Add services/mediatranscoding to format check.

Bug: 145628554
Test: Build
Change-Id: I99ed67abdf272e792f3dc7b910a0207da58f1baa
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index bfd907e..df1d88e 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -8,3 +8,4 @@
 # Only turn on clang-format check for the following subfolders.
 clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp
                media/libmediatranscoding/
+               services/mediatranscoding/