bcache: add MODULE_DESCRIPTION information

This patch moves MODULE_AUTHOR and MODULE_LICENSE to end of super.c, and
add MODULE_DESCRIPTION("Bcache: a Linux block layer cache").

This is preparation for adding module parameters.

Signed-off-by: Coly Li <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/md/bcache/super.c

···
 #include <linux/reboot.h>
 #include <linux/sysfs.h>
 
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Kent Overstreet <[e-mail]>");
-
 static const char bcache_magic[] = {
 	0xc6, 0x85, 0x73, 0xf6, 0x4e, 0x1a, 0x45, 0xca,
 	0x82, 0x65, 0xf5, 0x7f, 0x48, 0xba, 0x6d, 0x81
···
 
 module_exit(bcache_exit);
 module_init(bcache_init);
+
+MODULE_DESCRIPTION("Bcache: a Linux block layer cache");
+MODULE_AUTHOR("Kent Overstreet <[e-mail]>");
+MODULE_LICENSE("GPL");