mmc: sdhci-of-dwcmshc: Fix reset, clk, and SDIO support for Eswin EIC7700

mmc: sdhci-of-dwcmshc: Fix reset, clk, and SDIO support for Eswin EIC7700

The EIC7700 code in sdhci-of-dwcmshc uses host->mmc->caps2 to select
different configuration paths for different card types. The current logic
distinguishes eMMC and SD, but does not handle SDIO separately.

Update the EIC7700 card-type checks so that eMMC, SD and SDIO are
distinguished explicitly.

Switch the reset path to dwcmshc_reset() so that pending interrupt state
is cleared consistently, and use sdhci_enable_clk() so the clock enable
sequence follows the standard SDHCI flow.

Fixes: 32b2633219d3 ("mmc: sdhci-of-dwcmshc: Add support for Eswin EIC7700")
Signed-off-by: Huan He <hehuan1@eswincomputing.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulfh@kernel.org>