Bluetooth: btmrvl: add sd8997 chipset support

This patch adds support for Marvell's new chipset SD8997.
Register offsets and supported feature flags are updated.

Signed-off-by: Zhaoyang Liu <liuzy@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>