[Bug 195009] [patch]: [arm] Use 400 kHz as the default OMAP4 I2C bus speed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195009

--- Comment #7 from Ian Lepore <ian at FreeBSD.org> ---
You need to reset the bus after changing the speed with sysctl to make the
change take effect, i2c -r -f /dev/iic#.  I'm waiting for a review from the
documentation team before I check in the new manpage that tells you that.  :)

Also, I forgot to mention in the commit message, but I checked the bus speeds
with an oscilloscope on a beaglebone white to verify that the new divisors are
correct.  I also verified that i2c eeprom devices can be read at all 3 speeds. 
I don't have hardware to test omap4.

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