RTEMS | Add the support for i2c driver in the aarch64/raspberrypi bsp (!363)

[Shaunak Datar (@skdatar)]

Shaunak Datar commented on a discussion on bsps/aarch64/raspberrypi/i2c/raspberrypi-i2c.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_125189

 > +
 > +  bus->input_clock = clock_rate;
 > +
 > +  return 0;
 > +}
 > +
 > +static int rpi_i2c_setup_transfer( raspberrypi_i2c_bus *bus )
 > +{
 > +  int rv;
 > +  while ( bus->remaining_transfers > 0 ) {
 > +    bus->remaining_bytes = bus->remaining_transfers > 1 ?
 > +                             BCM2711_I2C_DLEN_MASK :
 > +                             ( bus->current_buffer_size & BCM2711_I2C_DLEN_MASK
 > +                             );
 > +    BCM2835_REG( bus->base_address + BCM2711_I2C_DLEN ) = bus->remaining_bytes;
 > +    S_REG( bus ) = S_ERR | S_CLKT | S_DONE;

These three bits are the errors status bits on the BCM2711- they are cleared by writing 1 to them- that is why `S_REG( bus ) = S_ERR | S_CLKT | S_DONE;` this line is added

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/363#note_125189
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