Commander : Effectively track failure reporting and handle hotplug sensors

UAVCAN footprint reduction

Since mtd already checks whether CONFIG_MTD_RAMTRON is set in
defconfig use this define to check whether to call ramtron_attach()
or at24xxx_attach() in the main function, instead of checking
CONFIG_ARCH_BOARD_PX4FMU-V1.

Also instead of using #ifdef CONFIG_ARCH_BOARD_AEROCORE to determine
whether to start mtd on spi 2 or 4, rather use a new board define
PX4_SPI_BUS_RAMTRON in the board_config.h file.

Handling and logging the RC RSSI value

Hotfix : fix commander LED reporting

Matrix update to fix LPE for nuttx

Attitude estimator Q: Add low pass to yaw axis for control state topic, publish raw attitude and prevent double filtering of attitude

Attitude estimator hot fix.

Adds valgrind support, started to correct some bugs in SITL