rockchip: dwmmc: add handling for u-boot, spl-fifo-mode

Rockchips dwmmc controllers can't do dma to non-ddr addresses,
like for example the soc-internal sram but during boot parts of
TrustedFirmware need to be placed there from the read FIT image.

So add handling for a u-boot,spl-fifo-mode to not put the mmc
controllers into fifo mode for all time.

The regular fifo-mode property still takes precedent and only
if not set do we check for the spl-specific property.

Suggested-by: Philipp Tomsich <[email protected]>
Signed-off-by: Heiko Stuebner <[email protected]>
Reviewed-by: Kever Yang <[email protected]>
Signed-off-by: Philipp Tomsich <[email protected]>
Reviewed-by: Philipp Tomsich <[email protected]>

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