gpu: nvgpu: Add boost once GPU is initialized

Workaround for GPU hang if boost turns GPU on before it is
initialized.

Bug 1435870

Change-Id: I07d0617049612344ca7c494da8cb8d75789984e5
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/453375

drivers/gpu/nvgpu/gk20a/gk20a.h

@@ -259,6 +259,9 @@ struct gk20a {
 	void __iomem *bar1_saved;
 
 	bool power_on;
+#ifdef CONFIG_INPUT_CFBOOST
+	bool boost_added;
+#endif
 
 	struct rw_semaphore busy_lock;