dc: replace sleep in hotplug logic w/ completions

- removed ssleeps in dp.c, hdmi2.0.c, and dc.c which wait
for the completion of hpd_worker
- replaced them with wait_for_completion on hpd_complete
- signal the hpd_complete completion in all cases, not just
when dc->suspended is true
- reduces test time significantly

bug 2201832

Change-Id: I52cca4dafb3c05c681326d7f8f9b1a04f5788ada
Signed-off-by: Axel Feldmann <afeldmann@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1764881
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Ishwarya Balaji Gururajan <igururajan@nvidia.com>
Reviewed-by: Shu Zhong <shuz@nvidia.com>
Reviewed-by: Aron Wong <awong@nvidia.com>
Reviewed-by: Mitch Luban <mluban@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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