Set the "transport" element to not a mandantory

In hal_manifest.xsd, the "transport" element is mandantory, because
minOccurs is "1" (default). But some xml file in vintf/manifest doesn't
need the "transport" element. So minOccurs of the "transport" element is
changed to "0".

Bug: 149454650
Test: vts-tradefed run vts -m VtsValidateHalManifest
Change-Id: I0d88f97ae3adc73cf8d99d2a98008ec549c5cb6c
1 file changed