ARM: dts: omap4-droid4: Fix USB PHY port naming

We have a USB OCHI PHY on port 1 for mdm6600. Port 2 is using transceiverless
logic (TLL) for USB EHCI for w3glte modem.

Let's also fix the node name to use usb-phy while at it.

Cc: Marcel Partap <mpartap@gmx.net>
Cc: Michael Scott <michael.scott@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>