[][kernel][common][eth][Add a debugging command to retrieve PSE_LGC_INFO from CDM/GDM]

[Description]
Add a debugging command to retrieve PSE_LGC_INFO from CDM/GDM.

Usage: echo [port] [option] > /sys/kernel/debug/mtketh/pse_info
             0~15     0~2      Show PSE info
                       3       Show PSE legacy info

[Release-log]
N/A


Change-Id: Ic131c6e79df230458e9f81b6409da410c3b71e46
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/9026572
2 files changed