platform/diphda: use the latest tfm_rpc_psa* api declarations

The new tfm_rpc_psa* api declarations have removed the use of
caller type flag (secure or non-secure). This commit adapts to
the change and solves the issue of build failure.

Change-Id: I9dec58e357096dddec16209479387e4ee7aa57d4
Signed-off-by: Satish Kumar <satish.kumar01@arm.com>
1 file changed