drm/amd/display: [FW Promotion] Release 0.0.38

| [Header Changes]
|       - Add new SCRATCH15 boot option and fw_state member to skip
|         phy access
|       - Add new SCRATCH15 boot option and fw_state member to disable
|         clk gating
|       - Add defines for AUX return status
|       - Add defines for HPD events

Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>