Overload the buildRaPacket function with more parameters.

This CL refactors the buildRaPacket with some constants parameters such
as prefix, valid/preferred lifetime and etc, which de-duplicates some
code.

Bug: 382194967
Test: atest NetworkStackRootTests
Test: atest NetworkStackIntegrationTests
Change-Id: Ib452c0e8596e7b94f9739b9b0f4e5d7ab6661614
1 file changed