Fix for PR/49107.
Make sure pmap_copy_page_xscale clears the ptes afters its done with them.
SS device detection needs more work. #if 0 previous attempt for now.

PR/49106: panic: ehci_open: bad device speed 4
add PRAM access commands
if we get garbage from the RTC try again a couple times
this seems to happen more frequently when the PRAM battery goes bad
PR/49109: Jeremie Le Hen: fix sed relative addressin (1,+N)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192108
http://svnweb.freebsd.org/base?view=revision&revision=269302
XXX: pullup 7.