dt-bindings: net: wireless: ath11k: Drop "qcom,ipq8074-wcss-pil" from example

Convention for examples is to only show what's covered by the binding,
so drop the provider "qcom,ipq8074-wcss-pil". It is also not documented
by a schema which caused a warning.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240528134610.4075204-1-robh@kernel.org