[][kernel][mt7988][eth][i2.5Gphy: Add 20230621 version firmware]

[Description]
Fix corner sample issue in SLT and TCT issue against C50.

This patch only changes PMb file
PMb md5sum: 008a673ec3d744a37d70291f7b371538

[Release-log]
N/A

Change-Id: I9f6ec81850c6ced10cf3ff8712166c596705d79b
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7657943
1 file changed