Added servo write and updated pins layout.
Fixes bug with pwm and led not adding the am33xx_pwm kernel module on connect.
Remove servo support since needs to be tested with a real servo, and make sure this one does not bite the dust.
Remove servo write code until it has been testd in an actual servo without frying it.
Merge pull request #3 from hybridgroup/21-beaglebone-adaptor-servo

Fixes some bugs with setting up PWM on BBB automatically.