COMPMID-427: Port NEActivationLayer in 16bit fixed point.

Change-Id: Iebd61807f7b597c6bd990673bc7655c68ee16f4b
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/79085
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
diff --git a/arm_compute/core/FixedPoint.h b/arm_compute/core/FixedPoint.h
index 5eb4c55..774125e 100644
--- a/arm_compute/core/FixedPoint.h
+++ b/arm_compute/core/FixedPoint.h
@@ -251,7 +251,16 @@
 *
 * @return The result of the 8 bit fixed point exponential.
 */
-qint8_t sexp_qs8(qint8_t a, int fixed_point_position);
+qint8_t sqexp_qs8(qint8_t a, int fixed_point_position);
+
+/** 16 bit fixed point scalar exponential
+*
+* @param[in] a                    16 bit fixed point input
+* @param[in] fixed_point_position Fixed point position that expresses the number of bits for the fractional part of the number
+*
+* @return The result of the 16 bit fixed point exponential.
+*/
+qint16_t sqexp_qs16(qint16_t a, int fixed_point_position);
 
 /** 16 bit fixed point scalar exponential
 *