[Bug 231713] mmc_calculate_clock() does not work properly for cards with bus_timing_normal only

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231713

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: marius
Date: Wed Nov 21 19:49:22 UTC 2018
New revision: 340743
URL: https://svnweb.freebsd.org/changeset/base/340743

Log:
  MFC: r340495, MF12: r340739

  - Restore setting the clock for devices which support the default/legacy
    transfer mode only (lost with r321385). [1]
  - Similarly, don't try to set the power class on MMC devices that comply
    to version 4.0 of the system specification but are operated in default/
    legacy transfer or 1-bit bus mode as no power class is specified for
    these cases. Trying to set a power class nevertheless resulted in an -
    albeit harmless - error message.

  PR:           231713 [1]
  Approved by:  re (gjb)

Changes:
_U  releng/12.0/
  releng/12.0/sys/dev/mmc/mmc.c

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