msm: mdss: hdmi: Do not toggle HPD during HDCP re-authentication

Do not toggle the HPD circuitry during HDCP re-authentication as
this has undesirable side effects such as failure to detect cable
disconnection event. The HDCP engine already has a dedicated
software interface used to reset during HDCP re-authentication.

Change-Id: I76be51ea286fadabefc436613b420c4d6ac1946a
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>