mmc: tmio: sdhi: Use bounce buffer to avoid DMA limitations

mmc: tmio: sdhi: Use bounce buffer to avoid DMA limitations

The R-Car SDHI DMA controller has various restrictions. To work around
those restrictions without falling back to PIO, implement bounce buffer
with custom alignment check function which tests for those limitations.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Daniel Schwierzeck <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Peng Fan <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Tom Rini <[email protected]>