linux/device.h: fix kernel-doc notation warning

Fix kernel-doc build warning (missing " *" at beginning of line):

../include/linux/device.h:93: warning: bad line:                         this bus.

Fixes: 07397df2

 ("dma-mapping: move dma configuration to bus infrastructure")

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Nipun Gupta <nipun.gupta@nxp.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>