src/mainboard/amd: Remove unused <stdlib.h>

Change-Id: I61982309a4110f4f40193190e91224e909b575a9
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33888
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/mainboard/amd/gardenia/BiosCallOuts.c

@@ -16,7 +16,6 @@
 #include <amdblocks/agesawrapper.h>
 #include <amdblocks/BiosCallOuts.h>
 #include <soc/southbridge.h>
-#include <stdlib.h>
 
 void platform_FchParams_env(FCH_DATA_BLOCK *FchParams_env)
 {

src/mainboard/amd/gardenia/gpio.c

@@ -14,7 +14,6 @@
  */
 
 #include <soc/southbridge.h>
-#include <stdlib.h>
 #include <soc/gpio.h>
 
 #include "gpio.h"

src/mainboard/amd/padmelon/gpio.c

@@ -16,7 +16,6 @@
 #include <amdblocks/agesawrapper.h>
 #include <amdblocks/BiosCallOuts.h>
 #include <soc/southbridge.h>
-#include <stdlib.h>
 #include "gpio.h"
 
 /*