asmc: Add support for macmini 6,1 and 6,2 (late 2012) models
This adds the ASMC support for the macmini 6,1 and 6,2.
PR: kern/268141
Differential Revision: https://reviews.freebsd.org/D49929
(cherry picked from commit 93ca9e44b752e6a9aeb0f761a022d14281d1a4e3)