uboot-rockchip: add new package

This package is needed for the rockchip target.
Signed-off-by: Tobias Mädel <t.maedel@alfeld.de>
Tested-by: Tobias Schramm <t.schramm@manjaro.org>

package/boot/uboot-rockchip/Makefile

+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_VERSION:=2020.04
+
+PKG_HASH:=fe732aaf037d9cc3c0909bad8362af366ae964bbdac6913a34081ff4ad565372
+
+PKG_MAINTAINER:=Tobias Maedel <openwrt@tbspace.de>
+
+include $(INCLUDE_DIR)/u-boot.mk
+include $(INCLUDE_DIR)/package.mk
+
+define U-Boot/Default
+  BUILD_TARGET:=rockchip
+  UENV:=default
+  HIDDEN:=1
+endef
+
+define U-Boot/rockpro64-rk3399
+  BUILD_SUBTARGET:=armv8
+  NAME:=RockPro64
+  BUILD_DEVICES:= \
+    pine64_rockpro64
+  DEPENDS:=+PACKAGE_u-boot-rockpro64-rk3399:arm-trusted-firmware-rockchip
+  PKG_BUILD_DEPENDS:=arm-trusted-firmware-rockchip
+endef
+
+UBOOT_TARGETS := \
+  rockpro64-rk3399
+
+UBOOT_CONFIGURE_VARS += USE_PRIVATE_LIBGCC=yes
+
+UBOOT_MAKE_FLAGS += \
+  BL31=$(STAGING_DIR_IMAGE)/bl31.elf
+
+define Build/Configure
+	$(SED) s/subdir.*pylibfdt//g $(PKG_BUILD_DIR)/scripts/dtc/Makefile
+	$(call Build/Configure/U-Boot)
+
+	$(SED) 's#CONFIG_MKIMAGE_DTC_PATH=.*#CONFIG_MKIMAGE_DTC_PATH="$(PKG_BUILD_DIR)/scripts/dtc/dtc"#g' $(PKG_BUILD_DIR)/.config
+	echo 'CONFIG_IDENT_STRING=" OpenWRT"' >> $(PKG_BUILD_DIR)/.config
+endef
+
+define Build/InstallDev
+	$(INSTALL_DIR) $(STAGING_DIR_IMAGE)
+	$(CP) $(PKG_BUILD_DIR)/idbloader.img $(STAGING_DIR_IMAGE)/$(BUILD_VARIANT)-idbloader.img
+	$(CP) $(PKG_BUILD_DIR)/u-boot.itb $(STAGING_DIR_IMAGE)/$(BUILD_VARIANT)-u-boot.itb
+endef
+
+define Package/u-boot/install/default
+endef
+
+$(eval $(call BuildPackage/U-Boot))