After commit (2de2cf1 tools: sign_tool: uploading) in rkbin,
new rk_sign_tool has different usage than before, and the
version information is not continuous because it used new
skeleton.
So update rk_sign_tool usage.
Signed-off-by: Zain Wang <wzz@rock-chips.com>
Change-Id: I5d0a2f83a36636d95bac0c7ace3cd93b2d16e586