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[Why] Similar to SST branch, gpio conflict also needs to be avoided on MST. Without doing so, there is a chance that gpio conflict will occur if multiple gpio interrupts arrive simultaneously. [How] By mutex locking/unlocking &aconnector->hpd_lock, we won't get gpio conflict when handling hpd. Signed-off-by: Zhan Liu <zhan.liu@amd.com> Signed-off-by: Nikola Cornij <nikola.cornij@amd.com> Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com> Acked-by: Zhan Liu <zhan.liu@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>