boot/barebox: don't specify .config to munge

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 7a2524bf546e646bef3ca32d63f56057d4da6586)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

boot/barebox/barebox.mk

@@ -110,8 +110,8 @@ endif
 
 ifneq ($$($(1)_CUSTOM_EMBEDDED_ENV_PATH),)
 define $(1)_KCONFIG_FIXUP_CMDS
-	$$(call KCONFIG_ENABLE_OPT,CONFIG_DEFAULT_ENVIRONMENT,$$(@D)/.config)
-	$$(call KCONFIG_SET_OPT,CONFIG_DEFAULT_ENVIRONMENT_PATH,"$$($(1)_CUSTOM_EMBEDDED_ENV_PATH)",$$(@D)/.config)
+	$$(call KCONFIG_ENABLE_OPT,CONFIG_DEFAULT_ENVIRONMENT)
+	$$(call KCONFIG_SET_OPT,CONFIG_DEFAULT_ENVIRONMENT_PATH,"$$($(1)_CUSTOM_EMBEDDED_ENV_PATH)")
 endef
 endif