hwrng: core - Remove duplicated include

Remove duplicated include of linux/random.h. Resolves checkincludes
message. And adjust includes in alphabetical order.

Signed-off-by: GUO Zihua <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/char/hw_random/core.c

···
 #include <linux/err.h>
 #include <linux/fs.h>
 #include <linux/hw_random.h>
-#include <linux/random.h>
 #include <linux/kernel.h>
 #include <linux/kthread.h>
-#include <linux/sched/signal.h>
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/sched.h>
+#include <linux/sched/signal.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>