classes/create-spdx: Fix up license reporting

Licenses reported in the SPDX documents should be either:
 A) A valid SPDX identifier cross referenced from the SPDX license
    database
 B) A "LicenseRef" to a license described in the SPDX document

The licensing code will now add a placeholder extracted license with
corresponding "LicenseRef" for any licenses that are not matched to the
SPDX database

Parenthesis in the license expression are now handled correctly

(From OE-Core rev: 28d9d035c0ff8fcaf28bc96a976a43a602a47e94)

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

meta/lib/oe/spdx.py

@@ -189,6 +189,13 @@ class SPDXExternalDocumentRef(SPDXObject):
     checksum = _Object(SPDXChecksum)
 
 
+class SPDXExtractedLicensingInfo(SPDXObject):
+    name = _String()
+    comment = _String()
+    licenseId = _String()
+    extractedText = _String()
+
+
 class SPDXDocument(SPDXObject):
     spdxVersion = _String(default="SPDX-" + SPDX_VERSION)
     dataLicense = _String(default="CC0-1.0")
@@ -200,6 +207,7 @@ class SPDXDocument(SPDXObject):
     files = _ObjectList(SPDXFile)
     relationships = _ObjectList(SPDXRelationship)
     externalDocumentRefs = _ObjectList(SPDXExternalDocumentRef)
+    hasExtractedLicensingInfos = _ObjectList(SPDXExtractedLicensingInfo)
 
     def __init__(self, **d):
         super().__init__(**d)