Fixes to tickless operation code.  From Brandon Warhurst
Add support for tickless operation using the NXP LPC43xx
More fixes to tickless operation, alarm/mode code.  From Brandon Warhurst
Update to the LPC43xx RIT/Tickless code.  From Brandon Warhurst
Update ChangeLog
EFM32:  Add configuration option to use USARTs as SPI
EFM32:  Add configuration option to use USARTs as SPI
Oops last changes still in editor
Merge remote-tracking branch 'upstream/master'
continue to merge with upstream