Change the way rkp tool obtains serial number

[Description]
1.Add patch to modify rkp_factory_extraction_tool, so
 that it can meet TV customer's factory product line.
2.Change the method for
rkp_factory_extraction_tool to get the serial number.
3.Introduce a new input parameter, serialno_prop,
to the function jsonEncodeCsrWithBuild.
4.Use the new property of serialno_prop if it is set,
otherwise defaults to "ro.serialno".

Test:
1.build pass
2.AC on/off pass
3.run "rkp_factory_extraction_tool
--output_format build+csr
--serialno_prop $(customer_prop) > csr.json" pass
4.run "rkp_factory_extraction_tool
--output_format build+csr > csr.json" pass
5.VtsHalRemotelyProvisionedComponentTargetTest pass
6.libkeymint_remote_prov_support_test pass
7.VtsAidlKeyMintTargetTest pass

Bug: 313811996
Change-Id: I8aa83bacab22f0a28bc54aea9e816f75a382ffde