Revert "ramips: delete MTK 762x support"

This reverts commit 5d51ba1.

target/linux/ramips/Makefile

@@ -0,0 +1,26 @@
+#
+# Copyright (C) 2008-2011 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+
+ARCH:=mipsel
+BOARD:=ramips
+BOARDNAME:=MediaTek Ralink MIPS
+SUBTARGETS:=mt7620 mt7621 mt76x8 rt288x rt305x rt3883
+FEATURES:=squashfs gpio
+MAINTAINER:=John Crispin <[email protected]>
+
+KERNEL_PATCHVER:=4.14
+
+define Target/Description
+	Build firmware images for Ralink RT288x/RT3xxx based boards.
+endef
+
+include $(INCLUDE_DIR)/target.mk
+DEFAULT_PACKAGES += \
+	kmod-leds-gpio kmod-gpio-button-hotplug swconfig
+
+$(eval $(call BuildTarget))