Fix volatile compile warning in ffarpc_call_ep

Shared memory pointers held in the structure ffa_call_ep are
marked as 'volatile' but never actually treated as volatile
when the buffers are used. The volatile attribute is used
inappropriately and has been removed. This resolves the
long standing compile warning.

Signed-off-by: Julian Hall <julian.hall@arm.com>
Change-Id: I9f6df299203b2d735b37b1437ff75fcacf4f6bf2
1 file changed