brcmsmac: extend brcms_c_chipmatch() to also handle non PCIe devices

Now brcms_c_chipmatch() is also able to handle non PCI devices and also
does some checking for SoC if they are supported by brcmsmac.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>