drm/amd/powerplay: Fix code error for translating int type to bool type correctly

Fix code error to support value < 0 or > 1.
Signed-off-by: NChengming Gui <Jack.Gui@amd.com>
Reviewed-by: NHawking Zhang <hawking.zhang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -348,7 +348,7 @@ static int smu_early_init(void *handle)
 	struct smu_context *smu = &adev->smu;
 
 	smu->adev = adev;
-	smu->pm_enabled = amdgpu_dpm;
+	smu->pm_enabled = !!amdgpu_dpm;
 	mutex_init(&smu->mutex);
 
 	return smu_set_funcs(adev);