S6: PXP Bringup Bootloader bootup DSP code porting [2/2]

PD#SWPL-153936

Problem:
S6 PXP Bringup DSP.

Solution:
Code porting from t3x and ucode.

Verify:
Test in S6 PXP.

Change-Id: Idc6683d33469c455dd3754b12ebdfdf164738e2c
Signed-off-by: bangzheng.liu <bangzheng.liu@amlogic.com>
7 files changed