rockchip: Update the default USB Product ID value

RK3036 is using the USB product id normally used by RK3066B, and RK3328
is using the product id normally used by RK3368.

Fix this and update the default USB_GADGET_PRODUCT_NUM Kconfig option
for remaining supported Rockchip SoCs to match the product id used in
Maskrom mode.

Also remove a reference to an undefined ROCKCHIP_RK3229 Kconfig symbol.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>