COMPMID-2269: Implement POW operator for NEON

Change-Id: I7135f665d89da3c24c9bbe00e991a64713a41d0e
Signed-off-by: Usama Arif <usama.arif@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1128
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/Types.h b/arm_compute/core/Types.h
index 9ecd7ff..99ec44d 100644
--- a/arm_compute/core/Types.h
+++ b/arm_compute/core/Types.h
@@ -571,6 +571,7 @@
     MIN,          /**< Min(x, y) */
     MAX,          /**< Max(x, y) */
     SQUARED_DIFF, /**< (x - y)^2 */
+    POWER,        /**< x ^ y */
 };
 
 /** Available element wise unary operations */