package/pkg-kconfig: cleanup savedefconfig MAKE

The kconfig infra defines a 'PKG_KCONFIG_MAKE' var that wraps all the
standard kconfig options. Switch to this so we aren't duplicating the
logic.

Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 009d31b438b2c402fa959a9041f5cc9b050a1f8f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/pkg-kconfig.mk

@@ -33,8 +33,7 @@ PKG_KCONFIG_COMMON_OPTS = \
 # Macro to save the defconfig file
 # $(1): the name of the package in upper-case letters
 define kconfig-package-savedefconfig
-	$($(1)_MAKE_ENV) $($(1)_MAKE) -C $($(1)_DIR) \
-		$(PKG_KCONFIG_COMMON_OPTS) $($(1)_KCONFIG_OPTS) savedefconfig
+	$($(1)_KCONFIG_MAKE) savedefconfig
 endef
 
 # The correct way to regenerate a .config file is to use 'make olddefconfig'.