classes/spdx-common: Add SPDX version to path

Since multiple versions of SPDX are available, use the version in the
path

(From OE-Core rev: 35c061a4514905b3ebbb7f0633a584927519445c)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/create-spdx-2.2.bbclass

@@ -6,6 +6,8 @@
 
 inherit spdx-common
 
+SPDX_VERSION = "2.2"
+
 def get_namespace(d, name):
     import uuid
     namespace_uuid = uuid.uuid5(uuid.NAMESPACE_DNS, d.getVar("SPDX_UUID_NAMESPACE"))