Correctly check for support of Address Authentication

Check for both IMPLEMENTATION_DEFINED and Architected algorithms of
Address Authentication.

Change-Id: I209dcc6087172cfef7baf8d09e0454628f02cbd0
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/common/bl_common.c b/common/bl_common.c
index 4e76dd3..61f031b 100644
--- a/common/bl_common.c
+++ b/common/bl_common.c
@@ -265,7 +265,7 @@
 	 * system registers. Pointer authentication can't be enabled here or the
 	 * authentication will fail when returning from this function.
 	 */
-	assert(is_armv8_3_pauth_api_present());
+	assert(is_armv8_3_pauth_apa_api_present());
 
 	uint64_t *apiakey = plat_init_apiakey();