mmc: Add mmc-pwrseq driver
This driver is used to power up sdio card or eMMC.
It handle the reset-gpio, clocks and needed delays for powerup/powerdown.
Sponsored by: Diablotin Systems
Differential Revision: https://reviews.freebsd.org/D30288
mmc: Add mmc-pwrseq driver Tags None Referenced Files None Subscribers None
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