amlv4l2dec: CB2 increase margin number [1/1]

PD#SWPL-182760

Problem:
default capture buffer margin number is 4.
sometimes compositor do not release capture
in time.so video freeze

Solution:
1.set default capture margin count to 6
2.set margin count to 4 when on low memory mode

Verify:
ap222

Change-Id: I7dfceaaca1cc938021f36f85205c1f10b512b573
Signed-off-by: fei.deng <fei.deng@amlogic.com>
2 files changed