package/pkg-kconfig: fix *-savedefconfig under ppd

The 'linux-savedefconfig' target fails with the below error when
PER_PACKAGE_DIRECTORIES is enabled and the 'host-finalize' target hasn't
run yet.

  scripts/Kconfig.include:39: C compiler '.../buildroot/output/host/bin/arm-buildroot-linux-gnueabihf-gcc' not found

The 'PPD' variable isn't defined for this target, so 'BR_PATH' falls
back to the final host directory.

Reported-by: Nathaniel Roach <nroach44@gmail.com>
Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/pkg-kconfig.mk

@@ -270,6 +270,7 @@ $(1)-check-configuration-done:
 
 ifeq ($$($(2)_KCONFIG_SUPPORTS_DEFCONFIG),YES)
 .PHONY: $(1)-savedefconfig
+$(1)-savedefconfig: PKG=$(2)
 $(1)-savedefconfig: $(1)-check-configuration-done
 	$$(call kconfig-package-savedefconfig,$(2))
 endif