[][CRITICAL][kernel][mt7988][eth][Fix issue of transmitting abnormal data for SGMII]

[Description]
Fix issue of transmitting abnormal data for SGMII.

Without this patch, the SGMII may be transmitting abnormal data because
FIFOs are corrupted.

[Release-log]
N/A


Change-Id: I8c2c3f62b64bf79e3f7777376556ea72c1de9d30
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8821439
1 file changed