Config sensor stuff.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>
Changes for LED stuff, add debug message for LED driver check, debug messages output be turned on by default.

NOTE:

# Debug options
pca953x.cpp > PCA953X_DEBUG
led.cpp > LED_DEBUG

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>