RTEMS | aarch64/raspberrypi: Add Watchdog Timer driver (!120)

[Ning Yang (@yangn0)]

Ning Yang commented on a discussion on bsps/aarch64/raspberrypi/start/watchdog.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/120#note_109934

 > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 > + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 > + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 > + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 > + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 > + * POSSIBILITY OF SUCH DAMAGE.
 > + */
 > +
 > +#include <bsp/raspberrypi.h>
 > +#include <bsp/watchdog.h>
 > +
 > +#define PM_WDOG BCM2835_REG(BCM2711_PM_WDOG)
 > +#define PM_RSTC BCM2835_REG(BCM2711_PM_RSTC)
 > +
 > +int raspberrypi_watchdog_count = 0;

https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/120#note_109477

I designed the interface with reference to `sparc/leon3/include/bsp/watchdog.h`. It seems to have multiple wdt devices. But in rpi4 there is only one, should I keep it consistent?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/120#note_109934
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