drivers/misc: dont send content stream type for HDMI sinks

Remove sending the content stream type message for HDMI sinks.
This message is applicable only for DP receivers.

Sending this message for HDMI sinks is a write to unknown
space which causes undefined behavior on some sinks.

Change-Id: Id4894021528c17ebaeb5818a2bdcf7ae9c91c070
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>