Add soong config var for library linking strategy

Support building cc modules with different library linking strategies
for apexes, to support different apex strategies pre/post S

Test: m APEX_BUILD_FOR_PRE_S_DEVICES
      library_linking_strategy_sample_binary
Bug: 154663937
Change-Id: Ic95ddce5e2b0619adff5b6b8a4e2da0d44df7173