mmc: rockchip_sdhci: Set xx_TAP_VALUE for RK3528

eMMC erase and write support on RK3528 is somewhat unreliable, sometime
e.g. mmc erase and write commands will fail with an error.

Use the delay line lock value for half card clock cycle, DLL_LOCK_VALUE,
to set a manual xx_TAP_VALUE to fix the unreliable eMMC support.

This is only enabled for RK3528, remaining SoCs still use the automatic
tap value, (DLL_LOCK_VALUE * 2) % 256, same value we configure manually
for RK3528.

Signed-off-by: Jonas Karlman <[email protected]>
Reviewed-by: Kever Yang <[email protected]>

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