msm: mdss: hdcp: change the name of hdmi_hdcp to generic one

Currently hdcp 1.x is being used by HDMI only. But it can be
used by other interfaces like DP (Display Port). Change the
name of the hdmi_hdcp module to hdcp_1x so that different
interfaces uses more generic name for hdcp 1.x instead of
the interface specific name.

Change-Id: I0cb88c5715dd10c4fad5491e5f05ea489a7ab175
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>