ramips: Improve compatible for TP-Link Archer devices

Include "Archer" in compatible as it is part of the device name.

Update Makefile device names where necessary to match compatible.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ramips/base-files/lib/upgrade/platform.sh

@@ -45,7 +45,7 @@ platform_do_upgrade() {
 	xiaomi,mir3p)
 		nand_do_upgrade "$ARGV"
 		;;
-	tplink,c50-v4)
+	tplink,archer-c50-v4)
 		MTD_ARGS="-t romfile"
 		default_do_upgrade "$ARGV"
 		;;