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: I5e2c4b01dc11299e136b81f4ee3d817aa04c71cb
1 file changed
tree: 914e8e81d05db00ecc1fa29c1e84189646f52b73
  1. msm8998/
  2. Android.mk