MFC r275944, r275946, r275949, r275950:

MFC r275944, r275946, r275949, r275950:

  Add code to set and reset open-drain mode on the bus when requested.

  When command and data interrupts have been aggregated together, don't do
  the data-completed processing if a command-error interrupt is also asserted.

  Add a new sdhci quirk, SDHCI_QUIRK_WAITFOR_RESET_ASSERTED, to work around
  TI OMAP controllers which will return the reset-in-progress bit as zero if
  you read the status register too fast after setting the reset bit.

git-svn-id: svn://svn.freebsd.org/base/stable/10@276287 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f