scripts: add mkkrnlimg tool to pack rockchip format image

sync from kernel develop-4.4:
(3091608 arm64: dts: rockchip: fixup vccio3-supply for ai-va-v10)

Change-Id: I4c67dfc617c99791d2706e2b260a79f

scripts: add mkkrnlimg tool to pack rockchip format image

sync from kernel develop-4.4:
(3091608 arm64: dts: rockchip: fixup vccio3-supply for ai-va-v10)

Change-Id: I4c67dfc617c99791d2706e2b260a79fd3419b29d
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>

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