SoC c3 : scripts : add uboot package function. [2/2]

PD#SH-19850

Problem:
Need to optimize the compilation script and add uboot package function.

Solution:
add uboot package function.

Verify:
N/A

Change-Id: I74f83f30985457955bced9084450155e6846054b
Signed-off-by: yongbing.he <yongbing.he@amlogic.com>
1 file changed