tuna: Set max brightness and default vibrator intensity

  After this: http://review.cyanogenmod.org/47466
we lost the ability to set the brightness level to the
maximum supported by the device. With this change,
we can have a better view of the screen under sunlight.
NOTE: Good values may be: 50% 55% 75% (RGB)

  Furthermore, the default vibration intensity is
decrease from 100% to 85% for lower battery consumption.

Change-Id: Ic4e45453baa78745f01838c8f94b9b923582f7e9