di: aptimise di flow, add some protection [1/1]

di: aptimise di flow, add some protection [1/1]

PD#SWPL-3976

Problem:
To prevent “stall when access DDR through memory interface”

Solution:
1.aptimise NRWR register access flow
2.add arb on/off and status check
3.add reset protect
4.add nr_en disable before arb status check
5.add nr_write_done sel
6.modify VPU_WRARB_MODE_L2C1 from vlsi feijun's suggest

Verify:
tl1, txlx

Change-Id: Ifb0f4f0502d957ffb2b07805575c27f4166d5717
Signed-off-by: Yong Qin <yong.qin@amlogic.com>