refactor(el3-runtime): plat_ic_has_interrupt_type returns bool

Rather than returning 0 or 1, the above function returns bool false
or true. No functional change.

Change-Id: Iea904ffc368568208fa8203e0d2e0cdaa500b1e0
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
diff --git a/bl31/interrupt_mgmt.c b/bl31/interrupt_mgmt.c
index 1c26834..68c7f10 100644
--- a/bl31/interrupt_mgmt.c
+++ b/bl31/interrupt_mgmt.c
@@ -47,7 +47,7 @@
  ******************************************************************************/
 static int32_t validate_interrupt_type(uint32_t type)
 {
-	if (plat_ic_has_interrupt_type(type) != 0) {
+	if (plat_ic_has_interrupt_type(type)) {
 		return 0;
 	}