dt-bindings: interconnect: qcom,rpmh: do not require reg on SDX65 MC virt

dt-bindings: interconnect: qcom,rpmh: do not require reg on SDX65 MC virt

The MC virt interconnect in SDX65 DTSI does not have reg.  Similarly in
the downstream DTS, thus assume this is an interconnect without own
dedicated IO address space.  This fixes dtbs_check warnings like:

  qcom-sdx65-mtp.dtb: interconnect-mc-virt: 'reg' is a required property

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230827114026.47806-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Georgi Djakov <djakov@kernel.org>