target: msm8610: set pwm duty cycle to 50% for backlight

In previous design, the mpp output that controlled backlight was
simply set to high in lk booting stage, which would lead to high
power consumption. Now set pwm duty cycle to 50% for backlight.

Change-Id: I44048a2366302adbbe7e047173c05ee081a86c29
1 file changed