ARM: dts: tango4: Request RGMII RX and TX clock delays

commit 985333b0eef8603b02181c4ec0a722b82be9642d upstream.

RX and TX clock delays are required. Request them explicitly.

Fixes: cad008b8 ("ARM: dts: tango4: Initial device trees")
Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>