msm: mdss: hdmi: fix HDCP1.4 authentication issues

After part I authentication, SW DDC is not disabled and because of
this, we observe arbitration issues during part III authentication.
Disable SW DDC before starting part III of HDCP authentication.

Fail part II of authentication with repeater if its device count is zero.

Change-Id: I72f5b1115c094d4a72ae2b324f3903cdb195e5fe
Signed-off-by: Narender Ankam <nankam@codeaurora.org>