ddr: detect bandwidth except mali and reduce bandwidth [2/3]

ddr: detect bandwidth except mali and reduce bandwidth [2/3]

PD#SWPL-122

Problem:
ddr bandwidth is tightly in many cases, such as HDR/4K video playing,
and then refresh osd at the same time

Solution:
in most cases the problem is refreshing osd when bandwidth tightly,
so detect ddr bandwidth usage except mali and reduce it when it is tightly

Verify:
verify by p321/r311

Change-Id: Ia594f08dbe9a8a7a8d78b5104c93bddaa8229c0b
Signed-off-by: wenbiao zhang <wenbiao.zhang@amlogic.com>