The HCI firmware for the QCA6390 BT/WiFi chips doesn't logically belong
to the USB-only linux-firmware-qca-qca61x4 package. Split it to the
separate package in order to simplify firmware management. This follows
the pending WHENCE change in the linux-firmware upstream, where the
QCA6390 firmware is split to a separate section.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>