mediatek: ASUS TUF-AX6000: fix phy-handle numbering
To fix issue #15304
Correct br-lan ports 1-4 so that phy-handle matches reg nr not port label.
Fixes: eb13076e77 ("mediatek: fix DTS defining mt7530 switch phys but not referencing them")
Signed-off-by: Magnus Lindström <[email protected]>