u-boot: remove unused BOOTARGS / BOOTCMD handling

Not available in Kconfig and no references to it in the tree.

target/u-boot/Makefile.in

@@ -134,16 +134,6 @@ ifneq ($(strip $(BR2_TARGET_UBOOT_ETH1ADDR)),"")
 	$(call insert_define, CONFIG_ETH1ADDR, $(BR2_TARGET_UBOOT_ETH1ADDR))
 endif
 endif
-ifneq ($(strip $(BR2_TARGET_UBOOT_BOOTARGS)),)
-ifneq ($(strip $(BR2_TARGET_UBOOT_BOOTARGS)),"")
-	$(call insert_define, CONFIG_BOOTARGS, $(BR2_TARGET_UBOOT_BOOTARGS))
-endif
-endif
-ifneq ($(strip $(BR2_TARGET_UBOOT_BOOTCMD)),)
-ifneq ($(strip $(BR2_TARGET_UBOOT_BOOTCMD)),"")
-	$(call insert_define, CONFIG_BOOTCOMMAND, $(BR2_TARGET_UBOOT_BOOTCMD))
-endif
-endif
 ifeq ($(BR2_TARGET_UBOOT_SILENT),y)
 	$(call insert_define, CONFIG_SILENT_CONSOLE,)
 endif
@@ -298,8 +288,6 @@ u-boot-status:
 	@echo BR2_TARGET_UBOOT_NETMASK = $(BR2_TARGET_UBOOT_NETMASK)
 	@echo BR2_TARGET_UBOOT_ETH0ADDR = $(BR2_TARGET_UBOOT_ETHADDR)
 	@echo BR2_TARGET_UBOOT_ETH1ADDR = $(BR2_TARGET_UBOOT_ETH1ADDR)
-	@echo BR2_TARGET_UBOOT_BOOTARGS = $(BR2_TARGET_UBOOT_BOOTARGS)
-	@echo BR2_TARGET_UBOOT_BOOTCMD = $(BR2_TARGET_UBOOT_BOOTCMD)
 	@echo BR2_TARGET_UBOOT_SILENT = $(BR2_TARGET_UBOOT_SILENT)
 	@echo UBOOT_BOARD_NAME=$(UBOOT_BOARD_NAME)
 	@exit 0