sdhci supports up to 65535 blocks transfers, at91_mci - one block.
Enable multiblock operations disabled before to follow at91_mci driver
limitations.
Reviewed by: imp@
Driver supports PCI devices with class 8 and subclass 5 according to
SD Host Controller Specification.
Update NOTES, enable module and static build.
Enable related mmc and mmcsd modules build.
Discussed on: mobile@, current@