Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Expand indirect reference to BSD license with the current one.

Add struct definition of the Elan MMCR registers (from jb@)

Put a CTASSERT() on the size of the struct.

Use the struct where it is easy to do so in elan_mmcr.c

Add the Elan specific hardware reset code (also from jb@).