The PSTR is already define as a NOP for all supported platforms. It's
only needed for AVR so here we remove all the uses throughout the
codebase.
This was automated with a simple python script so it also converts
places which spans to multiple lines, removing the matching parentheses.
AVR-specific places were not changed.
Merged a bug fix where mode would not revert on geo-fence disable.
The mode would not revert if the switch was in position 0.
Geofencing will soon be in Rover and I didn't want to forget this bug
and chase it later so committing it now. It works fine in Rover now
even though the geofencing code isn't in yet.