Eliminate unnecessary references to pte.h internals by using the standard
pmap_kenter_temporary() to map pages while dumping.

Submitted by:	Svatopluk Kraus <onwahe@gmail.com>,
		Michal Meloun <meloun@miracle.cz>


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276187 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f