msm: mdss: dp: Fix PD compliance issues

Fix issues found during PD compliance testing for DisplayPort
downstream ports:

- The outgoing DP Status message must contain a single VDO. This
  also fixes certain devices which would not respond unless there
  was a status object included in the request. Initialize this to
  0x1 to indicate that the DFP_D is connected.
- Don't send Enter Mode if the discovered mode doesn't support UFP_D.
- Don't send Configure if the Status response doesn't support UFP_D.

Change-Id: I690860613670753ae6634786f3ee2746a36be54a
Signed-off-by: Jack Pham <jackp@codeaurora.org>