qcom: add firmware for the onboard WiFi on qcm2290 / qrb4210

Platforms using qcm2290 and qrb4210 SoCs require the wlanmdsp.mbn file
to boot the WiFi core (similar to the sdm845 platforms). However these
platforms reject existing wlanmdsp.mbn. Provide a separate wlanmdsp.mbn
file to be used by these two platforms only.

- WLAN.HL.3.3.7.c2-00855-QCAHLSWMTPLZ-1

Cc: Kalle Valo <kvalo@qca.qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

WHENCE

@@ -5648,6 +5648,7 @@ RawFile: qcom/qcm2290/adspua.jsn
 File: qcom/qcm2290/modem.mbn
 RawFile: qcom/qcm2290/modemr.jsn
 RawFile: qcom/qcm2290/modemuw.jsn
+File: qcom/qcm2290/wlanmdsp.mbn
 File: qcom/qrb4210/a610_zap.mbn
 File: qcom/qrb4210/adsp.mbn
 RawFile: qcom/qrb4210/adspr.jsn
@@ -5658,6 +5659,7 @@ RawFile: qcom/qrb4210/cdspr.jsn
 File: qcom/qrb4210/modem.mbn
 RawFile: qcom/qrb4210/modemr.jsn
 RawFile: qcom/qrb4210/modemuw.jsn
+Link: qcom/qrb4210/wlanmdsp.mbn -> ../qcm2290/wlanmdsp.mbn
 File: qcom/sdm845/adsp.mbn
 RawFile: qcom/sdm845/adspr.jsn
 RawFile: qcom/sdm845/adspua.jsn