gpu: host1x: Add debug support

Add support for host1x debugging. Adds debugfs entries, and dumps
channel state to UART in case of stuck job.

Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

drivers/gpu/host1x/hw/cdma_hw.c

@@ -244,6 +244,8 @@ static void cdma_timeout_handler(struct work_struct *work)
 	host1x = cdma_to_host1x(cdma);
 	ch = cdma_to_channel(cdma);
 
+	host1x_debug_dump(cdma_to_host1x(cdma));
+
 	mutex_lock(&cdma->lock);
 
 	if (!cdma->timeout.client) {