boot: Use p2v in warmreset and rstrreset
boot: Use p2v in warmreset and rstrreset

Previously, these used physical addresses directly as virtual
addresses.  This works because we have an identity mapping at this
point in boot, but is ugly.  Translate these physical addresses like
every other physical address in xv6.

aclements/sv6,bowlofstew/sv6,bowlofstew/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,aclements/sv6,aclements/sv6