net: wget: let wget_with_dns work with dns disabled

This was marked as TODO in the code:
 - Enable use of wget_with_dns even if CMD_DNS is disabled if
   the given uri has the ip address for the http server.
 - Move the check for CMD_DNS inside wget_with_dns.
 - Rename wget_with_dns to wget_do_request

Signed-off-by: Adriano Cordova <adrianox@gmail.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>

include/net-common.h

@@ -501,13 +501,16 @@ int dhcp_run(ulong addr, const char *fname, bool autoload);
 int do_tftpb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 
 /**
- * wget_with_dns() - runs dns host IP address resulution before wget
+ * wget_do_request() - sends a wget request
+ *
+ * Sends a wget request, if DNS resolution is enabled it resolves the
+ * given uri.
  *
  * @dst_addr:	destination address to download the file
  * @uri:	uri string of target file of wget
  * Return:	zero on success, negative if failed
  */
-int wget_with_dns(ulong dst_addr, char *uri);
+int wget_do_request(ulong dst_addr, char *uri);
 /**
  * wget_validate_uri() - varidate the uri
  *