Add a basic iomux driver for imx6.

Submitted by:	bsam@


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271097 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Merge the amd64 and i386 identcpu.c into a single x86 implementation.
This brings the structured extended features mask and VT-x reporting to
i386 and Intel cache and TLB info (under bootverbose) to amd64.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271098 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f