Crypto: Update connection handle check

Replace PSA_IS_HANDLE_VALID with PSA_HANDLE_IS_VALID which is
defined in PSA FF for checking the validity of connection handle.

Change-Id: I11be7d4fd5ecf0125fa422ce9a9ec759a0a41b61
Signed-off-by: Summer Qin <summer.qin@arm.com>