The properties specific for SD host controllers. For properties shared by MMC
host controllers refer to the mmc[1] bindings.

  [1] Documentation/devicetree/bindings/mmc/mmc.txt

Optional properties:
- sdhci-caps-mask: The sdhci capabilities register is incorrect. This 64bit
  property corresponds to the bits in the sdhci capabilty register. If the bit
  is on in the mask then the bit is incorrect in the register and should be
  turned off, before applying sdhci-caps.
- sdhci-caps: The sdhci capabilities register is incorrect. This 64bit
  property corresponds to the bits in the sdhci capability register. If the
  bit is on in the property then the bit should be turned on.