Misc changes to get a clean build after all of the syslog changes.  There are probably other things still broken

Remove non-functional vestiges of OTGHS in FS mode (including OTGFS2); try to convert the stm32f429i-disco configuration to use OTGHS instead of OTFHS in FS mode (OTGFS2).  But I don't have the boards and can't test

Repartition some message queue logic: sched/mqueue should have all mqueue knowledge; fs/mqueue should deal only with inodes

Fix some comments:  Remove button description from GPIO interrupt handlers that derive from the button interrupt handler