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sdhci: extend bus_dma_tag boundary to 64-bit space

Description

sdhci: extend bus_dma_tag boundary to 64-bit space

This patch adds support for the SDHCI_CAN_DO_64BIT
capability, so that to allow 64-bit DMA operation
for the controllers which support this feature.

Reviewed by: manu
Obtained from: Semihalf
Sponsored by: Marvell
Differential Revision: https://reviews.freebsd.org/D30560
MFC after: 2 weeks