soc/mediatek: Use 'include <stdlib.h>' when appropriate

Also including <types.h>, is supposed to provide stdint and stddef.

Change-Id: Id6d881055826044d04843ba165641131b9111342
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33690
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/common/spi.c

@@ -17,10 +17,10 @@
 #include <assert.h>
 #include <console/console.h>
 #include <endian.h>
-#include <stdlib.h>
 #include <soc/pll.h>
 #include <soc/spi.h>
 #include <timer.h>
+#include <types.h>
 
 #define MTK_SPI_DEBUG 0
 

src/soc/mediatek/mt8173/flash_controller.c

@@ -21,12 +21,12 @@
 #include <spi_flash.h>
 #include <spi-generic.h>
 #include <stdint.h>
-#include <stdlib.h>
 #include <string.h>
 #include <symbols.h>
 #include <timer.h>
 #include <soc/symbols.h>
 #include <soc/flash_controller.h>
+#include <types.h>
 
 #define get_nth_byte(d, n)	((d >> (8 * n)) & 0xff)