intel: common: Clean up mailbox and sip header

Sort and rearrange definitions in both mailbox and sip header to
increase readability and maintainability.

Signed-off-by: Abdul Halim, Muhammad Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Change-Id: I5544c2f17efdf3174757c55afd8cc1062fbae856
2 files changed