dt-bindings: net: snps,dwmac: Fix "snps,kbbe" type

The driver and description indicate "snps,kbbe" is a boolean, not an
uint32.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://patch.msgid.link/20241101211331.24605-2-robh@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>