octeontx2-af: enforce single RVU AF probe

On Octeon series SoCs, the AF is an integrated device within the SoC, and
hardware resources such as NPC, NIX and related blocks are global and
coordinated by the AF driver.  Physical and virtual functions request those
resources via AF mailbox messages, so two AF driver instances cannot both
own that global state; firmware exposes only one AF PCI function at boot
and any further octeontx2-af PCI probe returns -EBUSY so software matches
the single-AF model.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Link: https://patch.msgid.link/20260609040453.711932-2-rkannoth@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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