Add 'rd' alias to new brd ramdisk driver

Alias brd to rd in the hope of helping legacy users. Suggested by Jan.

Signed-off-by: Nick Piggin <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/block/brd.c

···
 MODULE_PARM_DESC(max_part, "Maximum number of partitions per RAM disk");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_BLOCKDEV_MAJOR(RAMDISK_MAJOR);
+MODULE_ALIAS("rd");
 
 #ifndef MODULE
 /* Legacy boot options - nonmodular */