drm/amdgpu: Correct the irq numbers for virtual crtc

The irq number should be decided by num_crtc, and the num_crtc could change
by parameter.
Signed-off-by: NEmily Deng <Emily.Deng@amd.com>
Reviewed by: Monk Liu <monk.liu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/dce_virtual.c

@@ -766,7 +766,7 @@ static const struct amdgpu_irq_src_funcs dce_virtual_crtc_irq_funcs = {
 
 static void dce_virtual_set_irq_funcs(struct amdgpu_device *adev)
 {
-	adev->crtc_irq.num_types = AMDGPU_CRTC_IRQ_VBLANK6 + 1;
+	adev->crtc_irq.num_types = adev->mode_info.num_crtc;
 	adev->crtc_irq.funcs = &dce_virtual_crtc_irq_funcs;
 }