drm/nv50-/disp: audit and version PIOR_PWR method

The full object interfaces are about to be exposed to userspace, so we
need to check for any security-related issues and version the structs
to make it easier to handle any changes we may need in the future.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvif/class.h

@@ -373,4 +373,11 @@ struct nv50_disp_sor_dp_pwr_v0 {
 	__u8  pad02[6];
 };
 
+struct nv50_disp_pior_pwr_v0 {
+	__u8  version;
+	__u8  state;
+	__u8  type;
+	__u8  pad03[5];
+};
+
 #endif