Documentation | user/bsp/aarch64: Add PWM documentation (!178)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion on user/bsps/aarch64/raspberrypi4.md: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/178#note_128372

 >  
 > +## PWM Driver
 > +
 > +The Raspberry Pi has 2 PWM masters PWM0 and PWM1.
 > +Each of these masters has 2 channels each PWMx_0 and PWMx_1.
 > +The PWM driver allows the user to configure the PWM clock,Data and Range.
 > +
 > +```c
 > +#include "bsp/raspberrypi-pwm.h"
 > +void pwm_example(){
 > +  /* Set the Clock divisor where 0 < DIVI < 4096. */
 > +  rtems_status_code sc = rpi_pwm_set_clock(DIVI);
 > +
 > +  /* Initialise the master and the channel with duty and range. 
 > +  * The DUTY cannot be greater than the RANGE
 > +  */

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/178#note_128372
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