drm/amd/display: Add a missing register field for HPO DP stream encoder

[Why&How]
Add the missing definition to set the register field
HBLANK_MINIMUM_SYMBOL_WIDTH
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dcn31/dcn31_hpo_dp_stream_encoder.h

@@ -162,7 +162,8 @@
 	SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_SDP_AUDIO_CONTROL0, AIP_ENABLE, mask_sh),\
 	SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_SDP_AUDIO_CONTROL0, ACM_ENABLE, mask_sh),\
 	SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_VID_CRC_CONTROL, CRC_ENABLE, mask_sh),\
-	SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_VID_CRC_CONTROL, CRC_CONT_MODE_ENABLE, mask_sh)
+	SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_VID_CRC_CONTROL, CRC_CONT_MODE_ENABLE, mask_sh),\
+	SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_HBLANK_CONTROL, HBLANK_MINIMUM_SYMBOL_WIDTH, mask_sh)
 
 
 #define DCN3_1_HPO_DP_STREAM_ENC_REG_FIELD_LIST(type) \