hwrng: core - Remove list.h from the hw_random.h

The 'struct list' type is defined in types.h, no need to include list.h
for that.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/linux/hw_random.h

@@ -13,9 +13,8 @@
 #define LINUX_HWRANDOM_H_
 
 #include <linux/completion.h>
-#include <linux/types.h>
-#include <linux/list.h>
 #include <linux/kref.h>
+#include <linux/types.h>
 
 /**
  * struct hwrng - Hardware Random Number Generator driver