ramips-mt76x8: add support for Xiaomi Mi Router 4A (100M International Edition v2 - R4ACv2)

Co-Authored-By: Jan-Niklas Burfeind <github@aiyionpri.me>

docs/user/supported_devices.rst

@@ -542,6 +542,7 @@ ramips-mt76x8
 
   - Xiaomi Mi Router 4A (100M Edition) - MIR4A
   - Xiaomi Mi Router 4A (100M International Edition) - R4AC
+  - Xiaomi Mi Router 4A (100M International Edition v2) - R4ACv2
   - Xiaomi Mi Router 4C - R4CM
 
 rockchip-armv8

targets/ramips-mt76x8

@@ -124,6 +124,10 @@ device('xiaomi-mi-router-4a-100m-international-edition', 'xiaomi_mi-router-4a-10
 	factory = false,
 })
 
+device('xiaomi-mi-router-4a-100m-international-edition-v2', 'xiaomi_mi-router-4a-100m-intl-v2', {
+	factory = false,
+})
+
 device('xiaomi-mi-router-4c', 'xiaomi_mi-router-4c', {
 	factory = false,
 })