bl30: mailbox driver add unified error code [2/2]

PD#SH-18313

Problem:
Customer need add unified error code number on
mailbox driver for debug convenience

Solution:
Add unified error code number on mailbox driver
API

Verify:
A5_AV409

Change-Id: I3f0efdc69c1e322f53815cab24968939e82b89c9
Signed-off-by: Yao Jie <jie.yao@amlogic.com>
10 files changed