MT#59872 Remove NGCP_PXE_INSTALL variable

With this variable we had some tricks in ngcp-initial-configuration if
the Pro sp2 node is installer via iPXE/cm image.

Now we support installation of sp2 via iPXE only so no need to pass this
variable.

But we need to keep parent ngcppxeinstall parameter as we need this
information for netcardconfig.

Change-Id: I20491289917cbb427ad6f5670f108c632838be71

templates/scripts/includes/deployment.sh

@@ -1024,7 +1024,6 @@ IP2="${IP2}"
 IP_HA_SHARED="${IP_HA_SHARED}"
 MANAGEMENT_IP="${MANAGEMENT_IP}"
 NETWORK_DEVICES="${NETWORK_DEVICES}"
-NGCP_PXE_INSTALL="${NGCP_PXE_INSTALL}"
 TARGET_HOSTNAME="${TARGET_HOSTNAME}"
 EOF
   fi