mmc: sdhci-pci: Remove dead code (cd_gpio, cd_irq et al)

The last user of this struct gone couple of releases ago.
Remove the dead code for good and encourage people to use
MMC core functionality for that.

The removal is dependent on the previous removal of the
struct sdhci_pci_data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20211014132613.27861-5-andriy.shevchenko@linux.intel.com


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