Delete Makefile_rockchip

Makefile_rockchip

-# SPDX-License-Identifier: GPL-2.0-only
-
-include $(TOPDIR)/rules.mk
-
-BOARD:=rockchip
-BOARDNAME:=Rockchip
-FEATURES:=ext4 audio usb usbgadget display gpio fpu pci pcie rootfs-part boot-part squashfs
-SUBTARGETS:=armv8
-
-KERNEL_PATCHVER:=6.6
-
-define Target/Description
-	Build firmware image for Rockchip SoC devices.
-endef
-
-include $(INCLUDE_DIR)/target.mk
-
-DEFAULT_PACKAGES += uboot-envtools partx-utils mkf2fs kmod-gpio-button-hotplug \
-		    fdisk automount autocore luci-app-cpufreq
-
-KERNELNAME:=Image dtbs
-
-$(eval $(call BuildTarget))