defaultsetup: Inherit create-spdx by default

This has been tested in poky by default for a while and ew've hopefully resolved
most of the gremlins. THis is the direction we're recommending for license/manifest
requirements so set it by default for OE.

(From OE-Core rev: b34032ec22921d4fd0982c17e63732cdbbc1885a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/distro/defaultsetup.conf

@@ -14,7 +14,7 @@ TMPDIR .= "${TCLIBCAPPEND}"
 
 USER_CLASSES ?= ""
 PACKAGE_CLASSES ?= "package_ipk"
-INHERIT_DISTRO ?= "debian devshell sstate license remove-libtool"
+INHERIT_DISTRO ?= "debian devshell sstate license remove-libtool create-spdx"
 INHERIT += "${PACKAGE_CLASSES} ${USER_CLASSES} ${INHERIT_DISTRO}"
 
 INIT_MANAGER ??= "none"