Merge branch 'net-sfp-quirk-support-for-xgs-pon-ont-sticks-with-unclean-eeproms'

Martino Dell says:

====================
net: sfp: quirk support for XGS-PON ONT sticks with unclean EEPROMs

Some clone XGS-PON ONT sticks return EEPROM reads where the vendor PN
field contains non-printable garbage past the legitimate string instead
of the SFF-8472 mandated space padding. sfp_strlen() then can't trim
the field, the exact-length check in sfp_match() rejects the quirk
entry before the string comparison runs, and the quirk silently never
applies - so the kernel honors the module's spurious TX_FAULT and
eventually disables it.

Patch 1 adds an opt-in part-prefix-matching flag to the quirk table so
such modules can still be matched; the vendor name is always matched
exactly and existing entries behave as before. Patch 2 adds two ONT
stick entries wired to the existing potron fixup: the "OEM"
XGSPONST2001, which needs the prefix matching (it returns trailing
garbage in the PN field on cold power-up reads), and the Fiberstore
XGS-SFP-ONT-MACI, whose PN field is fully occupied by the truncated
product name and matches exactly.

Both quirks are in production use on a Bananapi BPI-R4 (MT7988A)
router on an XGS-PON uplink, backported onto 6.12.
====================

Link: https://patch.msgid.link/20260812154708.2201266-1-tillo@tillo.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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