WIP: sdhci-dwc: adsp-sc598: consume emmc_timer_cmq clock

[sipraga]

Fixes an odd race. Need to understand when/why this clock is needed.

To reproduce: build with CONFIG_MMC_SDHCI_OF_DWCMSHC=m and boot rootfs over NFS. Then mmc will probe much later than the disabling of unused clocks. emmc_timer_cmq is then disabled and you hit the error.

Another issue: the clock in the DT headers is mislabelled QMC. Also in the clock driver. To fix...

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[sipraga]

Need to learn more about this clock before merging. Just putting this here as a fix in case people are blocked.

[pamolloy]

Would also be good to write a hardware test for this