dt-bindings: net: Define interrupt constraints for DWMAC vendor bindings

The `snps,dwmac.yaml` binding currently sets `maxItems: 3` for the
`interrupts` and `interrupt-names` properties, but vendor bindings
selecting `snps,dwmac.yaml` do not impose these limits.

Define constraints for `interrupts` and `interrupt-names` properties in
various DWMAC vendor bindings to ensure proper validation and consistency.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Link: https://patch.msgid.link/20250309003301.1152228-1-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>