Address comments: change names and remove unnecessary lines

src/core/lib/iomgr/iomgr_uv.c

src/core/lib/iomgr/iomgr_uv.h

src/core/lib/iomgr/pollset_uv.c

src/core/lib/iomgr/resolve_address_uv.c

src/core/lib/iomgr/tcp_client_uv.c

src/core/lib/iomgr/tcp_server_uv.c

src/core/lib/iomgr/tcp_uv.c

src/core/lib/iomgr/timer_uv.c