Android: Add LLVM support for Android O

Android O moves to LLVM 3.9 and also has some differences in header
dependencies as LLVM has moved to blueprint files. It seems libLLVMCore
was only needed for header dependencies, so we can drop that for O.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
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