remove comment and rearrange import order

Author: sreenithi

src/python/grpcio/grpc/_cython/cygrpc.pyx

@@ -37,6 +37,7 @@ _LOGGER = logging.getLogger(__name__)
 # TODO(atash): figure out why the coverage tool gets confused about the Cython
 # coverage plugin when the following files don't have a '.pxi' suffix.
 include "_cygrpc/grpc_string.pyx.pxi"
+include "_cygrpc/absl.pyx.pxi"
 include "_cygrpc/arguments.pyx.pxi"
 include "_cygrpc/call.pyx.pxi"
 include "_cygrpc/channel.pyx.pxi"
@@ -76,9 +77,6 @@ include "_cygrpc/aio/call.pyx.pxi"
 include "_cygrpc/aio/channel.pyx.pxi"
 include "_cygrpc/aio/server.pyx.pxi"
 
-# Include only for OSS
-include "_cygrpc/absl.pyx.pxi"
-
 #
 # initialize gRPC
 #