drm/v3d: Deprecate V3D 3.3 and 4.1 support

V3D 3.3 (Broadcom BCM7268) and V3D 4.1 (Broadcom BCM7278) has had no
in-tree userspace since Mesa dropped support in 2024, on the grounds
that those generations were no longer being tested. The situation in
the kernel is similar: the maintainers don't have this hardware, the
hardware is not available for purchase, and there is no known user of
these GPUs.

With no userspace left to drive it and no known users, maintaining the
ver <= 41 code paths is a cost without a benefit, considering that these
paths are not being exercised on real hardware.

As a first step toward removal, emit a deprecation warning at probe for
V3D versions earlier than or equal to 4.1. The hardware remains
functional for now; this only warns. If any real user appears and
explain its use-case, support can be retained.

Schedule the removal of V3D 3.3 and 4.1 support to the next kernel
release.

Link: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25851
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patch.msgid.link/20260606185616.694188-2-mcanal@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>

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