ramips: mt7621: add TL-R605 v1 as alternative name for TP-Link ER605 v1

This was the original name for the TP-Link ER605 v1 before rebranding.
Hardware is identical. Adds DEVICE_ALT0 entries for the original branding.

Signed-off-by: Charles Joynson <ctjoynson@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/24682
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
(cherry picked from commit 4a2873190c)
Link: https://github.com/openwrt/openwrt/pull/24681
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/ramips/image/mt7621.mk

@@ -3041,6 +3041,9 @@ define Device/tplink_er605-v1
   DEVICE_VENDOR := TP-Link
   DEVICE_MODEL := ER605
   DEVICE_VARIANT := v1
+  DEVICE_ALT0_VENDOR := TP-Link
+  DEVICE_ALT0_MODEL := TL-R605
+  DEVICE_ALT0_VARIANT := v1
   DEVICE_PACKAGES := -wpad-basic-mbedtls -uboot-envtools
   IMAGE_SIZE := 13760k
 endef