arm64: dts: qcom: apq8096-db820c: specify adsp firmware name

Specify firmware name to be used for the ADSP. Quoting Bjorn from the
respective apq8016-sbc commit:

The firmware for the modem and WiFi subsystems platform specific and is
signed with a OEM specific key (or a test key). In order to support more
than a single device it is therefor not possible to rely on the default
path and stash these files directly in the firmware directory.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211104002949.2204727-1-dmitry.baryshkov@linaro.org

arch/arm64/boot/dts/qcom/apq8096-db820c.dts

@@ -166,6 +166,7 @@ bluetooth {
 
 &adsp_pil {
 	status = "okay";
+	firmware-name = "qcom/apq8096/adsp.mbn";
 };
 
 &blsp2_i2c1 {