[Feature][T8TSK-209][Modem]Update Modem version to P5 0531

Change-Id: I2e8eae57738092652f476deea2da04d69e7f8426
diff --git a/mcu/protocol/interface/ims/ltecsr_struct.h b/mcu/protocol/interface/ims/ltecsr_struct.h
index 2baae25..1993b56 100755
--- a/mcu/protocol/interface/ims/ltecsr_struct.h
+++ b/mcu/protocol/interface/ims/ltecsr_struct.h
@@ -594,6 +594,7 @@
     LTECSR_ECFG_RA_SINR_POOR_TH                     = 49,
     LTECSR_ECFG_RA_SINR_GOOD_TH                     = 50,
 	
+	LTECSR_ECFG_HOLDCALL_DL_CHECK_PARA              = 52,	
     LTECSR_ECFG_MAX                                 ,
 } ecfg_e;