Bluetooth: btqca: Rename ROME specific variables to generic variables

Variables which are named with rome are commonly used for all the
BT SoC's. Instead of continuing further, renamed them to generic
name.

Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>