Core: Detect the concurrent handling handle in psa_call

According to PSA FF 1.0.0, it is a PROGRAMMER ERROR when the connection
is already handling a request.

Change-Id: I2f445a948e094adf0f177c57b6924113bc130ca9
Signed-off-by: Shawn Shan <shawn.shan@arm.com>
1 file changed