AndroidKernel.mk: Pass -mno-android to gcc if supported

When using a cross compiler that supports both Android
and non-Android configurations, pass the -mno-android flag
to use non-Android spec to compile the kernel.

Change-Id: Ibd952f3aea06f9f4f8c957c8e2a7666dd5dcdbba
Signed-off-by: David Ng <dave@codeaurora.org>