Cleanup: Avoid duplicative defines for CPU textures, use the ones from util_texture.h

Also includes some further byte -> byte4 renaming, missed that in last commit.

intern/cycles/device/device_cpu.cpp

@@ -27,6 +27,9 @@
 #include "device.h"
 #include "device_intern.h"
 
+/* Texture limits and slot info */
+#include "util_texture.h"
+
 #include "kernel.h"
 #include "kernel_compat_cpu.h"
 #include "kernel_types.h"