boot/uboot: handle generated defconfigs

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

boot/uboot/uboot.mk

@@ -147,13 +147,11 @@ define UBOOT_CONFIGURE_CMDS
 endef
 else ifeq ($(BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG),y)
 ifeq ($(BR2_TARGET_UBOOT_USE_DEFCONFIG),y)
-UBOOT_SOURCE_CONFIG = $(UBOOT_DIR)/configs/$(call qstrip,\
-	$(BR2_TARGET_UBOOT_BOARD_DEFCONFIG))_defconfig
+UBOOT_KCONFIG_DEFCONFIG = $(call qstrip,$(BR2_TARGET_UBOOT_BOARD_DEFCONFIG))_defconfig
 else ifeq ($(BR2_TARGET_UBOOT_USE_CUSTOM_CONFIG),y)
-UBOOT_SOURCE_CONFIG = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE))
+UBOOT_KCONFIG_FILE = $(call qstrip,$(BR2_TARGET_UBOOT_CUSTOM_CONFIG_FILE))
 endif # BR2_TARGET_UBOOT_USE_DEFCONFIG
 
-UBOOT_KCONFIG_FILE = $(UBOOT_SOURCE_CONFIG)
 UBOOT_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
 UBOOT_KCONFIG_OPTS = $(UBOOT_MAKE_OPTS)
 endif # BR2_TARGET_UBOOT_BUILD_SYSTEM_LEGACY