drm/i915/ehl: Make icp_digital_port_connected() use phy instead of port

When looking at SDEISR to determine the connection status of combo
outputs, we should use the phy index rather than the port index.
Although they're usually the same thing, EHL's DDI-D (port D) is
attached to PHY-A and SDEISR doesn't even have bits for a "D" output.
It's also possible that future platforms may map DDIs (the internal
display engine programming units) to PHYs (the output handling on the IO
side) in ways where port!=phy, so let's look at the PHY index by
default.

v2: Rename to intel_combo_phy_connected.  (Lucas)

Fixes: 719d24002602 ("drm/i915/ehl: Enable DDI-D")
Cc: José Roberto de Souza <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Signed-off-by: Matt Roper <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 3d1e388d4072dd240e558709d2f73605a742a723)
Signed-off-by: Joonas Lahtinen <[email protected]>

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