T3X: rtos_sdk add t3x board bc302, bc309 and sky [1/1]

PD#SWPL-116654

Problem:
rtos_sdk t3x board is only t3x_skt.

Solution:
rtos_sdk add t3x board bc302,bc309 and sky, delete t3x_skt.

Verify:
local build pass.

Change-Id: I00055919223293cc6758d10fe2b4f7625a97d2fb
Signed-off-by: bangzheng.liu <bangzheng.liu@amlogic.com>
46 files changed