rpb-ltd-gateway-image: install linux-firmware-qca by default
rpb-ltd-gateway-image: install linux-firmware-qca by default

Required by the Killer BT cards.

Signed-off-by: Ricardo Salveti <6fd42f733b6586c555e01d4ff3116fc7e73e7330@linaro.org>

linaro-technologies/meta-ltd