Bluetooth: btqca: Moved extracting rom version info to common place

Moved extracting rom version info to common place as this code is
common in all if else ladder in qca_uart_setup.

Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>