tart to clean up the armv6 kernel configs by reducing the diff between
them in the first sections and the later FDT support.

Differential Revision:	https://reviews.freebsd.org/D1346
Reviewed by:	rpaulo (earlier version)


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276003 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f