dt-bindings: net: wireless: describe the ath12k PCI module

Add device-tree bindings for the ATH12K module found in the WCN7850
package.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240605122106.23818-3-brgl@bgdev.pl