Functional 3D LUT intrinsic.

1600x1000 takes ~23ms on manta.

Change-Id: I142d6dedded66df05aa5f49e3da409a34c6e1b6e
diff --git a/cpu_ref/Android.mk b/cpu_ref/Android.mk
index 062a916..ddc87f9 100644
--- a/cpu_ref/Android.mk
+++ b/cpu_ref/Android.mk
@@ -21,6 +21,7 @@
 	rsCpuRuntimeStubs.cpp \
 	rsCpuScriptGroup.cpp \
 	rsCpuIntrinsic.cpp \
+	rsCpuIntrinsic3DLUT.cpp \
 	rsCpuIntrinsicBlend.cpp \
 	rsCpuIntrinsicBlur.cpp \
 	rsCpuIntrinsicColorMatrix.cpp \