[spi][stm32] get rid of stupid remapping, SPI3 is now really spi3 (spi0 doesn't exist on stm32)
[sim] stripped down pc_sim.h board file (with BOARD_HAS_BARO)
[electrical] only use adc for vsupply if ADC_CHANNEL_VSUPPLY is defined
[conf] set auto2 to nav in quadrotor example