refactor(el3_runtime): remove unnecessary assembly macros

Following macros removed
  - handle_async_ea : It duplicates "check_and_unmask_ea" functionality
  - check_if_serror_from_EL3: This macro is small and called only once,
    replace this macro with instructions at the caller.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Id7eec6263ec23cc8792139f491c563f616fd3618
1 file changed