linux-firmware: make linux-firmware-qcom-qcm6490-wifi provide -qcs6490-
The package linux-firmware-qcom-qcm6490-wifi also provides a symlink
qcom/qcs6490/wpss.mbn. Follow the pattern established by
linux-firmware-qcom-qcm6490-audio and -compute packages and make this
package RPROVIDE the qcs6490 name.