dt-bindings: usb: bdc: Update compatible strings

Remove "brcm,bdc-v0.16" because it was never used on any system.
Add "brcm,bdc-udc-v2" which exists for any STB system with BDC.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>