OPNSense/src c722f5fsys/dev/mmc mmc.c

MFC: r340495

- Restore setting the clock for devices which support the default/legacy
  transfer mode only (lost with r321385). [1]
- Similarly, don't try to set the power class on MMC devices that comply
  to version 4.0 of the system specification but are operated in default/
  legacy transfer or 1-bit bus mode as no power class is specified for
  these cases. Trying to set a power class nevertheless resulted in an -
  albeit harmless - error message.

PR:     231713 [1]
DeltaFile
+14-8sys/dev/mmc/mmc.c
+14-81 files

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