Apply known workarounds for modern MacBooks.

The legacy USB circuit tends to give trouble on MacBook.
While the original report covered MacBook, extend the fix
preemptively for the newer MacBookPro too.

PR:		191693
Reviewed by:	emaste
MFC after:	5 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271149 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f