RTEMS | bsp/aarch64/raspberrypi: Add Mailbox Support (!915)

[Shaunak Datar (@skdatar)]

Shaunak Datar commented on a discussion on bsps/aarch64/raspberrypi/start/mailbox.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_139007

 > +{
 > +    if (((uintptr_t)buffer & (MBOX_BUFFER_ALIGNMENT - 1)) != 0) {
 > +        return RTEMS_INVALID_ADDRESS;
 > +    }
 > +
 > +    memset(buffer, 0, size);
 > +    return RTEMS_SUCCESSFUL;
 > +}
 > +
 > +
 > +
 > +void rpi_mbox_write(uint8_t channel, uint32_t data){
 > +    while(BCM2835_REG(BCM2711_MBOX_STATUS) & BCM2711_MBOX_FULL){
 > +    }
 > +
 > +    BCM2835_REG(BCM2711_MBOX_WRITE) = (data & MBOX_MAIL_DATA_MASK) | (channel & MBOX_MAIL_CHANNEL_MASK);

Created an enum `bcm2711_mbox_channel` in `bsps/aarch64/raspberrypi/start/mailbox.c` and removed the macros them in `bsps/aarch64/raspberrypi/include/bsp/raspberrypi.h`

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/915#note_139007
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