MMC core:

 - Propagate correct error code for RPMB requests

MMC host:
 - sdhci-iproc: Drop hard coded cap for 1.8v
 - sdhci-iproc: Fix 32bit writes for transfer mode
 - sdhci-iproc: Enable SDHCI_QUIRK2_HOST_OFF_CARD_ON for cygnus
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