tcp_transport: list files manually in component cmake file

components/tcp_transport/CMakeLists.txt

@@ -1,4 +1,8 @@
-set(COMPONENT_SRCDIRS ".")
+set(COMPONENT_SRCS "transport.c"
+                   "transport_ssl.c"
+                   "transport_tcp.c"
+                   "transport_utils.c")
+
 set(COMPONENT_ADD_INCLUDEDIRS "include")
 
 set(COMPONENT_REQUIRES lwip esp-tls)