Integrate the hw.pcic.pd6722_vsense tunable from the nomads list.

This allows one to select the method of 3.3V card detection from the
three possible choices (none (0), the "6710 way" (1) and the "6729
way" (2)).  The default is the 6710 way, since it works in the most
cases.  The datasheets for the 6722 suggest that the '29 way is more
correct, but experience has shown this method to cause some laptops to
hang solid.  See source code for details until I update the man page.

Submitted by: shibata-san (chiharu shibata <chi@bd.mbn.or.jp>)

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