hdcp: add cancel_delayed_work()

Sometimes external monitors send HPD_UNPLUG right after DP connection
has been established. This is usually due to bad DP link quality.

HDCP stack needs to react properly to these quick disconnects.
Need to call cancel_delayed_work() if delayed HDCP work is pending.

Bug: 274517648
Signed-off-by: Petri Gynther <pgynther@google.com>
Change-Id: Id2a42f08d4843a55e490c844ed0afb6c55203a4e
1 file changed