mmc: sdhci-pxav2: enable CONFIG_MMC_SDHCI_IO_ACCESSORS

Enable CONFIG_MMC_SDHCI_IO_ACCESSORS for the pxav2 driver. The read_w
callback is needed for a silicon bug workaround in the PXA168.

Signed-off-by: Doug Brown <doug@schmorgal.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230116194401.20372-3-doug@schmorgal.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>