ANDROID: kasan, LLVMLinux: add clang-specific CFLAGS_KASAN

clang and gcc have slightly different syntax for asan parameters.

Change-Id: Ic06f85d3b82010cfdd8138e459337134e9ae48ba
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Git-commit: 9d93dcc112a6c34854be51b071f0ab0a66491fb4
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>