drm/amd/pm: Fix spelling mistake "disble" -> "disable"

There is a spelling mistake in an assert message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c

@@ -1300,7 +1300,7 @@ static int smu7_start_dpm(struct pp_hwmgr *hwmgr)
 				(0 == smum_send_msg_to_smc(hwmgr,
 						PPSMC_MSG_PCIeDPM_Disable,
 						NULL)),
-				"Failed to disble pcie DPM during DPM Start Function!",
+				"Failed to disable pcie DPM during DPM Start Function!",
 				return -EINVAL);
 	}