common: add usbplug support

- disable some message
- add "usbplug.bin" generation
- add minimum usbplug dtb support
- add individual board_init_r() init sequence.

Signed-off-by: Joseph Chen <chenjh

common: add usbplug support

- disable some message
- add "usbplug.bin" generation
- add minimum usbplug dtb support
- add individual board_init_r() init sequence.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: If48ee49247fca6108db3a1fbab3b403241b3a8eb

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