Take the training-wheels off, after nearly 30 months of development. MFC to
stable/9 planned after MFC 3-day period. The MFC to stable/9 is desired for
the next release to get some much-needed time:
+ Living side-by-side with sysinstall for compare/contrast/transition
+ Living side-by-side with bsdinstall for integration/transition
+ Additional feedback/testing before eventual 10.0-R to make it even better

MFC after:	3 days
Don't clear the SYSCONFIG register on boot.

This follows section 18.4.2.2 SD Soft Reset Flow in the TI AM335x Technical
Reference Manual and seems to fix the "ti_mmchs0: Error: current cmd NULL,
already done?" messages.
Remove unneeded page lock around vm_page_insert().

Submitted by:	alc