mailbox: qcom-apcs-ipc: add IPQ8074 APSS clock support

IPQ8074 has the APSS clock controller utilizing the same register space as
the APCS, so provide access to the APSS utilizing a child device like
IPQ6018.

IPQ6018 and IPQ8074 use the same controller and driver, so just utilize
IPQ6018 match data for IPQ8074.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>