drm/amd/display: Adding dpia debug bits for hpd delay

[Why]
Need to have dpia debug bits for configuring hpd delay.

[How]
Added hpd_delay_in_ms variable in dpia_debug_options.

Reviewed-by: Jimmy Kizito <Jimmy.Kizito@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: meenakshikumar somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>