Bluetooth: btmrvl: rename definitions from 88xx to 8897

Register offsets are different for SD8897 and newer chip SD8887.
We can not have common btmrvl_sdio_card_reg map for them.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>