dt-bindings: clock: qcom,rpmcc: Add SDM429

Document the qcom,rpmcc-sdm429 compatible and
add BB_CLK3 clock definition.

Signed-off-by: Daniil Titov <daniilt971@gmail.com>
Signed-off-by: Barnabás Czémán <barnabas.czeman@mainlining.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250212-sdm429-rpm-v1-1-0a24ac19a478@mainlining.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>