mmc: sdhci: Add VDD2 definition for power control register

Add new definition for VDD2 - UHS2 or PCIe/NVMe.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: Victor Shih <victor.shih@genesyslogic.com.tw>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20230609071441.451464-4-victorshihgli@gmail.com


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