Replace the clock divisor terms with values that also result in a 1 MHz
clock, but actually work on real hardware, unlike the original set of
values I chose.

PR:		195009
Submitted by:	Scott Ellis <jumpnowtek@gmail.com>


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276049 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f