use pca953x as default LED driver(cdev), and register it to "/dev/led", and disable original LED driver (led.cpp), and  disable original LED driver (led.cpp), because it don't work, don't know why it ?? hope somebody can debug it !!

fix bugs in pca953x driver in ioctl function, wrong return value.

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