[build][fidl] Replace "_llcpp" with "_cpp_wire"

See
https://groups.google.com/a/fuchsia.dev/g/fidl-dev/c/-A4Sjb7yEdc/m/QjlpUwqPBAAJ

Bug: 103483
Change-Id: Ice0ee2e8120eaebd2466c6b32e67c8195a209144
1 file changed