drm/tegra: hdmi - Add connector supply support

Revert commit 18ebc0f404 "drm/tegra: hdmi: Enable VDD earlier for
hotplug/DDC" and instead add a new supply for the +5V pin on the HDMI
connector.

The vdd-supply property refers to the regulator that supplies the
AVDD_HDMI input on Tegra, rather than the +5V HDMI connector pin. This
was never a problem before, because all boards had that pin hooked up to
a regulator that was always on. Starting with Dalmore and continuing
with Venice2, the +5V pin is controllable via a GPIO. For reasons
unknown, the GPIO ended up as the controlling GPIO of the AVDD_HDMI
supply in the Dalmore and Venice2 DTS files. But that's not correct.
Instead, a separate supply must be introduced so that the +5V pin can be
controlled separately from the supplies that feed the HDMI block within
Tegra.

A new hdmi-supply property is introduced that takes the place of the
vdd-supply and vdd-supply is only enabled when HDMI is enabled rather
than all the time.

Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/gpu/nvidia,tegra20-host1x.txt

@@ -136,6 +136,7 @@ of the following host1x client modules:
   - compatible: "nvidia,tegra<chip>-hdmi"
   - reg: Physical base address and length of the controller's registers.
   - interrupts: The interrupt outputs from the controller.
+  - hdmi-supply: supply for the +5V HDMI connector pin
   - vdd-supply: regulator for supply voltage
   - pll-supply: regulator for PLL
   - clocks: Must contain an entry for each entry in clock-names.