spi/orion: Directly include linux/size.h

Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-orion.c b/drivers/spi/spi-orion.c
index 5d90beb..d1bae77 100644
--- a/drivers/spi/spi-orion.c
+++ b/drivers/spi/spi-orion.c
@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/clk.h>
+#include <linux/sizes.h>
 #include <asm/unaligned.h>
 
 #define DRIVER_NAME			"orion_spi"