Merge branch 'net-usb-asix-ax88772-fix-potential-string-cut'

Andy Shevchenko says:

====================
net: usb: asix: ax88772: Fix potential string cut

The agreement and also PHY_MAX_ADDR limit suggest that the PHY address
can't occupy more than two hex digits. In some cases GCC complains about
potential string cut. In course of fixing this, introduce the PHY_ID_SIZE
predefined constant to make it easier for the users to know the bare
minimum for the buffer that holds PHY ID string (patch 1). With that,
fix the ASIX driver that triggers GCC accordingly (patch 2).
====================

Link: https://patch.msgid.link/20250324144751.1271761-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>