kern: physmem: don't truncate addresses in DEBUG output

Make it consistent with the above region printing, otherwise it appears
to be somewhat confusing.

(cherry picked from commit cd73914b01a1f2300e587f802383cc563f2e7103)
(cherry picked from commit 7b5cb32fca26428b8c0df98f9c58444557f808ae)
(cherry picked from commit c32946d8bee0d82042165c5d78b4d339d1268a2a)