Moku: Add mercury-specific components to the device trees.

This set is just those common to the eval boards. New parts coming soon.
Moku: Fix 12c switch connections in dts
DTS: remove incorrectly-formed comment
Moku01: Remove BT113 placeholder from DTS

There's no in-kernel driver and the userspace one can't burrow through
the mux, so the module's essentially useless as currently wired.