firmware: arm_scpi: Add include guard to linux/scpi_protocol.h
If this header is include twice, it will generate loads of compile
time error with the following below error pattern. It was reported by
0day kbuild robot on a branch pushed with double inclusion by accident.
This is based on the similar change in linux/scmi_protocol.h
error: conflicting types for ‘...’
note: previous declaration of ‘...’ was here
error: redefinition of ‘...’
Add a header include guard just in case.
Link: https://lore.kernel.org/r/20200403171018.1230-2-sudeep.holla@arm.com
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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