SDIO based brcm43456 is currently misdetected as brcm43455 and the wrong
firmware name is used. Correct the detection and load the correct
firmware file. Chiprev for brcm43456 is "9".
Signed-off-by: NOndrej Jirman <megous@megous.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>