build: add root Makefile [1/1]

PD#SWPL-61282

Problem:
Add root Makefile

Solution:
Add root Makefile

Verify:
ad401_a113l

Signed-off-by: kelvin.zhang <kelvin.zhang@amlogic.com>
Change-Id: If7357381ce2da756459fffe021ee23e0d6743c18
1 file changed