[][update CDM guard band follow DE suggestion]

[Description]
Change CDM guard band RSV_BUF from 0x40 to 0x 80
    - default 0x40 may cause xDMA hang

[Release-log]
N/A

Change-Id: I35709661d4715141b153c693d6d834e52e39f5d6
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5862368
1 file changed