mediatek: Include <linux/sizes.h> where needed

These files reference SZ_ macros without including <linux/sizes.h>,
correct this.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/spi/mtk_spim.c b/drivers/spi/mtk_spim.c
index b45ef52..a7c0fc5 100644
--- a/drivers/spi/mtk_spim.c
+++ b/drivers/spi/mtk_spim.c
@@ -22,6 +22,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/sizes.h>
 
 #define SPI_CFG0_REG				0x0000
 #define SPI_CFG1_REG				0x0004