bcma: support SPROM rev 11

Rev 11 works fine for me to set the MAC address of gmac0 and
gmac1 in the D-Link DWL-8610AP.

Cc: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221011122941.2053705-1-linus.walleij@linaro.org