gpu: host1x: Remove unused host1x_cdma_stop() definition

There is no host1x_cdma_stop() in the code, let's remove its definition
from the header file.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Erik Faye-Lund <kusmabite@gmail.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/host1x/cdma.h

@@ -88,7 +88,6 @@ struct host1x_cdma {
 
 int host1x_cdma_init(struct host1x_cdma *cdma);
 int host1x_cdma_deinit(struct host1x_cdma *cdma);
-void host1x_cdma_stop(struct host1x_cdma *cdma);
 int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
 void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
 void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);