Andrew Turner 27eb3304cd Add a helper function to read clock frequencies from videocore and use this
to get the default frequency of the sdhci device.

While here use a u_int to hold the frequency as it may be too large to fit
in a 32-bit signed integer. This is the case when we have a 250MHz clock.
2015-03-20 16:54:21 +00:00
..
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