hwrng: core - Move hwrng miscdev minor number to include/linux/miscdevice.h

This patch move the define for hwrng's miscdev minor number to
include/linux/miscdevice.h.
It's better that all minor number are in the same place.
Rename it to HWRNG_MINOR (from RNG_MISCDEV_MINOR) in he process since
no other miscdev define have MISCDEV in their name.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index ed30d5d..5d81f73 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -31,6 +31,7 @@
 #define SGI_MMTIMER		153
 #define STORE_QUEUE_MINOR	155	/* unused */
 #define I2O_MINOR		166
+#define HWRNG_MINOR		183
 #define MICROCODE_MINOR		184
 #define IRNET_MINOR		187
 #define VFIO_MINOR		196