ANDROID: HACK: arm64, LLVMLinux: replace prfm instruction in spin_lock_prefetch()

Follow the same hack applied to the other two prfm instructions by the
LLVMLinux patchstack.

Change-Id: Ifa44d187ef5221606bb4a2eb36de120415fe37b8
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Git-commit: c524856783cb4f9b92dfaf93366f3b1865e0279b
Git-repo: https://android.googlesource.com/kernel/common/


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