mmc: sdhci-dwcmshc: Refactor Rockchip platform data for controller revisions

The driver previously used an enum (dwcmshc_rk_type) to distinguish
platforms like the RK3568 and RK3588 based on DT compatible names.
This approach is inflexible, scales poorly for future revisions or
mixed-revision platforms, and conflates SoC names with controller
revisions. One example is RK3576 which lists "rockchip,rk3588-dwcmshc"
as a secondary compatible string just in order to claim it uses the
same controller revision as RK3588. This is confusing and makes it
error-prone to add new SoC support.

Introduces a new struct rockchip_pltfm_data containing a dedicated
revision field. The old enum is removed, and all code paths are
updated to use the revision-based data.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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