Makefile: Remove U-boot rules

Building u-boot in the android-kvm repo is deprecated (we use the AOSP
build scripts now), so remove the redundant build rules.

Test: make test
Change-Id: I006c7c6d8927867489cd1615dfe5ed78babd45a9
diff --git a/Makefile b/Makefile
index 4e3bd66..8979764 100644
--- a/Makefile
+++ b/Makefile
@@ -124,14 +124,14 @@
 default: kvm-unit-tests linux
 
 .PHONY: clean
-clean: buildroot_clean kvm-unit-tests_clean linux_clean u-boot_clean
+clean: buildroot_clean kvm-unit-tests_clean linux_clean
 
 .PHONY: distclean
 distclean:
 	- rm -rf $(OUT_DIR) $(DIST_DIR)
 
 .PHONY: all
-all: buildroot kvm-unit-tests linux u-boot
+all: buildroot kvm-unit-tests linux
 
 .PHONY: help
 help:
@@ -141,7 +141,6 @@
 	@echo '   buildroot            - the buildroot rootfs image as well as the host qemu'
 	@echo '   kvm-unit-tests       - the kvm-unit-tests'
 	@echo '   linux                - the linux kernel'
-	@echo '   u-boot               - the u-boot'
 	@echo ''
 	@echo 'Clean Targets:'
 	@echo '   clean                - cleans all, but keeps the prebuilts'
@@ -149,7 +148,6 @@
 	@echo '   buildroot_clean      - the buildroot rootfs image as well as the host qemu'
 	@echo '   kvm-unit-tests_clean - the kvm-unit-tests'
 	@echo '   linux_clean          - the linux kernel'
-	@echo '   u-boot_clean         - the u-boot'
 	@echo ''
 	@echo 'Test Targets:'
 	@echo '   test                 - runs all tests in qemu-aarch64 simulated environment'
@@ -269,44 +267,6 @@
 
 
 ##
-## u-boot
-##
-UBOOT_DEFCONFIG ?= pvmfw_arm64_defconfig
-UBOOT_VERBOSE ?= $(VERBOSE)
-UBOOT_SRC ?= $(ROOT_DIR)/u-boot
-UBOOT_OUT := $(OUT_DIR)/u-boot
-UBOOT_MAKE := \
-	PATH=$(TOOLCHAIN_BIN):$(GCC_TOOLCHAIN_BIN):$(PATH) \
-	ARCH=$(ARCH) \
-	CROSS_COMPILE="$(TARGET)-" \
-	$(MAKE) \
-	CC=$(CC) \
-	LD=$(LD) \
-	-C $(UBOOT_SRC) \
-	V=$(UBOOT_VERBOSE) \
-	O=$(UBOOT_OUT)
-
-UBOOT_CONFIG := $(UBOOT_OUT)/.config
-UBOOT_BIN := $(UBOOT_OUT)/u-boot.bin
-
-.PHONY: u-boot_defconfig
-u-boot_defconfig $(UBOOT_CONFIG):
-	+ $(UBOOT_MAKE) $(UBOOT_DEFCONFIG)
-
-.PHONY: u-boot_menuconfig
-u-boot_menuconfig: $(UBOOT_CONFIG)
-	+ $(UBOOT_MAKE) menuconfig
-
-.PHONY: u-boot
-u-boot $(UBOOT_BIN): $(UBOOT_CONFIG)
-	+ $(UBOOT_MAKE)
-
-.PHONY: u-boot_clean
-u-boot_clean:
-	+ $(UBOOT_MAKE) mrproper
-
-
-##
 ## Generating/Updating prebuilts
 ##