net, net-lwip: wget: suppress console output when called by EFI

Functions called from EFI applications should not do console output.
Refactor the wget code to implement this requirement. The wget_http_info
struct is used to hold the boolean that signifies whether the output is
allowed or not.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/efi_net.c

@@ -51,7 +51,7 @@ static int next_dp_entry;
 static struct wget_http_info efi_wget_info = {
 	.set_bootdev = false,
 	.check_buffer_size = true,
-
+	.silent = true,
 };
 #endif