Staging: spectra: remove non existing blk_fs_request wrapper

The spectra driver doesn't compile with today linux-next

The problem is that it tries to use a blk_fs_request macro. Searching
for this macro I saw that it used to exist in linux/blkdev.h as

#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)

This patch solves the issue eliminating the unnecessary (and now inexistent) wrapper

Signed-off-by: Javier Martinez Canillas <martinez.javier@gmail.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>