boards: particle_*: correct antenna selection sense

Experimentation with RSSI checks of BLE scans confirms that the
antenna switch setting is incorrect on the argon, boron, and xenon
platforms: when PCB is selected, performance is best with a uFL
antenna, and vice-versa.  Checks against the Particle OpenThread
firmware confirm that the correct practice is to invert the settings.
Though the SKY 13351 SPDT switch datasheet suggests otherwise it seems
the VCTLx signals are active low.

Switch the sense of all antennal selection output operations.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>