brcm: add firmware for newer version of BCM43241 SDIO chipset

This firmware is intended for revision 4 and above of the BCM43241
SDIO 802.11n chipset.
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -1698,6 +1698,7 @@ File: brcm/brcmfmac4329-sdio.bin
 File: brcm/brcmfmac4330-sdio.bin
 File: brcm/brcmfmac4334-sdio.bin
 File: brcm/brcmfmac43241b0-sdio.bin
+File: brcm/brcmfmac43241b4-sdio.bin
 
 Licence: Redistributable. See LICENCE.broadcom_bcm43xx for details.