scripts: add mcuboot build script. [11/14]

PD#SWPL-113076

Problem:
add mcuboot build script.

Solution:
add mcuboot build script.

Verify:
ad403_a113l

Change-Id: I84283d13845a8908dcd03a6800657493e98e5cde
Signed-off-by: fugui.zhang <fugui.zhang@amlogic.com>
2 files changed