Rename gyp file to highlight platform2 specifics
BUG=b:23764888
TEST=FEATURES=test emerge-gizmo libweave &&\
cros_workon_make --board=gizmo libweave --test
Change-Id: If724108f5a33de38e3378dd651b4207d0272d253
diff --git a/libweave/libweave.gyp b/libweave/platform2.gyp similarity index 100% rename from libweave/libweave.gyp rename to libweave/platform2.gyp