rng: eliminate common.h include from RNG drivers

Usage of common.h is deprecated.

* Remove common.h from RNG drivers.
* Sort includes.
* Add time.h to sandbox driver.
* Add linux/types.h to rng.h to provide size_t.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

include/rng.h

@@ -6,6 +6,8 @@
 #if !defined _RNG_H_
 #define _RNG_H_
 
+#include <linux/types.h>
+
 struct udevice;
 
 /**