rockchip: usb: gadget: add rk3066 product id

Product id of rk3066 usb otg is 0x300a.

Signed-off-by: Paweł Jarosz <paweljarosz3691@gmail.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
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