This patch adds the dt nodes for the extra usb2 picophys found on
the stih410.

These two picophys are used in conjunction with the extra ehci/ohci usb
controllers also found on the stih410 SoC.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>