[swss]: Change the env name from ASIC to platform (#1033)

dockers/docker-orchagent/orchagent.sh

@@ -2,9 +2,7 @@
 
 # Export platform information. Required to be able to write
 # vendor specific code.
-export platform=`sonic-cfggen -v onie_switch_asic`
-
-export ASIC=`sonic-cfggen -y /etc/sonic/sonic_version.yml -v asic_type`
+export platform=`sonic-cfggen -y /etc/sonic/sonic_version.yml -v asic_type`
 
 MAC_ADDRESS=`ip link show eth0 | grep ether | awk '{print $2}'`
 
@@ -16,9 +14,9 @@ ORCHAGENT_ARGS="-d /var/log/swss "
 ORCHAGENT_ARGS+="-b 8192 "
 
 # Add platform specific arguments if necessary
-if [ "$ASIC" == "broadcom" ]; then
+if [ "$platform" == "broadcom" ]; then
     ORCHAGENT_ARGS+="-m $MAC_ADDRESS"
-elif [ "$ASIC" == "cavium" ]; then
+elif [ "$platform" == "cavium" ]; then
     ORCHAGENT_ARGS+="-m $MAC_ADDRESS"
 fi