MMC core:

 - Restore reset-gpios to be optional in pwrseq_simple
 - Allow SDIO tuple for CISTPL_SDIO_STD
 - Print correct voltage value in debugfs
 - Enable tuning according to the actual timing
 - Limit SD card power limit according to cards capabilities

MMC host:
 - tmio_mmc_dma: don't print invalid DMA cookie
 - mmci: Pick the correct variant and allow 8-bit mode for Nomadik
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