drm/amd/display: fix bug with check for HPD Low in verify link cap

[Why]
There is a bug when determining if link training should be retried when
HPD is low in dp_verify_link_cap_with_retries.

[How]
Correctly, fail dp_verify_link_cap_with_retries without retry when
HPD is low.

Signed-off-by: Sivapiriyan Kumarasamy <sivapiriyan.kumarasamy@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Abdoulaye Berthe <Abdoulaye.Berthe@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>