Disable -Wimplicit-fallthrough unless src is fixed.

* Current -Wno-error=implicit-fallthrough caused
  clang-tidy assertion fault, see
  https://bugs.llvm.org/show_bug.cgi?id=39312
* We could enable this warning when source file is fixed.

Bug: 117780134
Test: build with WITH_TIDY=1
Change-Id: If0cd62d34be73304cf025b9abc96e4f309c87e98
1 file changed
tree: 36f4a7ff1e3f89e79907694cd5b35af3b396c602
  1. msm8998/
  2. Android.mk
  3. CleanSpec.mk