Fix typo in Driver Type A/C/D capability checks in sdhci.

[ivadasz]

Summary

Use the SDHCI_CAN_DRIVE_TYPE_A/_C/_D masks to check for Driver Type support,
instead of using the SDHCI_CTRL2_DRIVER_TYPE_A/_C/_D values which are meant
for setting the Driver Type in the HOST_CONTROL2 register.

[ivadasz]

The Driver Type capability bits are located in the CAPABILITIES2 register.

[adrian]

good catch!

[marius]

I no longer seem to be able to add inline comments in this crappy review thing; while at it,
the second hunk involved in printing capabilities should be changed to operate based on
host_caps and MMC_CAP_DRIVER_TYPE_x as generally, only SDHCI_CAN_VDD_x don't
have corresponding bits in host_caps.