intel: common: Improve mailbox driver readability
Use pre-defined macros for return values and common mailbox arguments

Signed-off-by: Abdul Halim, Muhammad Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Change-Id: I5d549ee5358aebadf909f79fda55e83ee9844a0e
1 parent 516f322 commit f8e6a09c64b59eebb1de712ccb7d3203b0184ad6
@Abdul Halim, Muhammad Hadi Asyrafi Abdul Halim, Muhammad Hadi Asyrafi authored on 14 May 2020
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plat/intel/soc/common/include/socfpga_mailbox.h
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plat/intel/soc/common/soc/socfpga_mailbox.c
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plat/intel/soc/common/socfpga_sip_svc.c