arm64: dts: qcom: sa8775p: fix the fastrpc label

The fastrpc driver uses the label to determine the domain ID and create
the device nodes. It should be "cdsp1" as this is the engine we use here.

Fixes: df54dcb3 ("arm64: dts: qcom: sa8775p: add ADSP, CDSP and GPDSP nodes")
Reported-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240816102345.16481-2-brgl@bgdev.pl


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