Remove networkstack-module-utils-srcs filegroup.

Once moving NetworkMonitorUtils to frameworks/libs/net is done, we can
remove the networkstack-module-utils-srcs filegroup from NetworkStack
module, instead import it from net-utils-device-common lib.

Bug: 238960524
Test: atest NetworkStackTests
Change-Id: Ifdb397f11369471e50574bdf3592e8551a5c0de8
4 files changed