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

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

Change-Id: I812d468c68b31917da5d406e2fb3b84bc6331b69
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33687
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/src/soc/nvidia/tegra210/dp.c b/src/soc/nvidia/tegra210/dp.c
index b0c0846..4284550 100644
--- a/src/soc/nvidia/tegra210/dp.c
+++ b/src/soc/nvidia/tegra210/dp.c
@@ -16,11 +16,11 @@
  * GNU General Public License for more details.
  *
  */
+
 #include <console/console.h>
 #include <device/device.h>
 #include <device/i2c_simple.h>
 #include <edid.h>
-#include <stdlib.h>
 #include <string.h>
 #include <delay.h>
 #include <soc/addressmap.h>
@@ -32,6 +32,8 @@
 #include <soc/nvidia/tegra/pwm.h>
 #include <soc/nvidia/tegra/displayport.h>
 #include <soc/sor.h>
+#include <types.h>
+
 #include "chip.h"
 
 #define DO_FAST_LINK_TRAINING	0