beaglebone.c: Add PWM output configuration
beaglebone.c: Add PWM output configuration

Signed-off-by: Salah-Eddine Missri <e2d72147e8842af537632da75d2207e10c722268@gmail.com>
Signed-off-by: Brendan Le Foll <3e0e8c4069934e8b47d99704927a85c66c0ceb33@intel.com>

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