[v3] drm/bridge: ti-sn65dsi86: ensure bridge suspend happens during PM sleep

[Stephen Boyd]

Quoting Harigovindan P (2020-06-09 05:04:55)
> ti-sn65dsi86 bridge is enumerated as a runtime device. When
> suspend is triggered, PM core adds a refcount on all the
> devices and calls device suspend, since usage count is
> already incremented, runtime suspend will not be called
> and it kept the bridge regulators and gpios ON which resulted
> in platform not entering into XO shutdown.
> 
> Add changes to force suspend on the runtime device during pm sleep.
> 
> Signed-off-by: Harigovindan P <harigovi at codeaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd at chromium.org>