Now that it is no longer used, remove SDHCI_QUIRK_MISSING_CAPS.

Note, from now on, __sdhci_read_caps() should be used to provide missing
capability flags.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230113110011.129835-7-adrian.hunter@intel.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>