drm/i915/psr: Fix PSR2 handling of multiplanar format

When a plane with a multiplanar format is added to the state by
drm_atomic_add_affected_planes(), only the UV plane is
added, so a intel_atomic_get_new_plane_state() call to get the Y
plane state can return a null pointer.
To fix this, intel_atomic_get_plane_state() should be called and
the return needs to be checked for errors, as it could return a EAGAIN
as other atomic state could be holding the lock for the Y plane.

Other issue with the patch being fixed is that the Y plane is not
being committed to hardware because the corresponded plane bit is not
set in update_planes when UV and Y planes are added to the state by
drm_atomic_add_affected_planes().

Cc: Jouni Högander <[email protected]>
Cc: Mika Kahola <[email protected]>
Fixes: 3809991ff5f4 ("drm/i915/display: Add initial selective fetch support for biplanar formats")
Signed-off-by: José Roberto de Souza <[email protected]>
Reviewed-by: Jouni Högander <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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