msm8660: Add neon based pow() function for Scorpion

Add #define to enable neon based pow() function for msm8660.

(cherry picked from commit f795151ff5dc4eb622b2630cb6f42353db4a1b55)

Change-Id: Iab0f30eb0583c30bcfd6940a23f47e98ffe075df
diff --git a/libm/Android.mk b/libm/Android.mk
index 6cf2342..205c813 100644
--- a/libm/Android.mk
+++ b/libm/Android.mk
@@ -178,6 +178,12 @@
     libm_common_cflags += -DSPARROW_NEON_OPTIMIZATION
   endif
 
+  ifeq ($(TARGET_USE_SCORPION_BIONIC_OPTIMIZATION),true)
+    libm_common_src_files += \
+          arm/e_pow.S
+    libm_common_cflags += -DSCORPION_NEON_OPTIMIZATION
+  endif
+
   libm_common_includes = $(LOCAL_PATH)/arm
 else
   libm_common_src_files += \