A4: rtos_sdk add a4 board ba400 and ba409 [1/1]

PD#SWPL-115361

Problem:
rtos_sdk a4m board is only a4_skt.

Solution:
rtos_sdk add a4 board ba400 and ba409, delete a4_skt.

Verify:
local build pass.

Change-Id: Ida8f60e5588b74f51830f229e546ad0e465cab66
Signed-off-by: bangzheng.liu <bangzheng.liu@amlogic.com>
31 files changed