tools: Add fit sign tools support

sync from next-dev:
(91b5d8722da scripts: Add fit-sign.sh)

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Signed-off-by: Xuhui Lin <xuhui.lin@rock-chips.com>
C

tools: Add fit sign tools support

sync from next-dev:
(91b5d8722da scripts: Add fit-sign.sh)

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Signed-off-by: Xuhui Lin <xuhui.lin@rock-chips.com>
Change-Id: I59c93391810ffe3753f55c64531a999fae9f5428

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