dt-bindings: mailbox: qcom: Document the APCS clock binding

Update the binding documentation for APCS to mention that the APCS
hardware block also expose a clock controller functionality.

The APCS clock controller is a mux and half-integer divider. It has the
main CPU PLL as an input and provides the clock for the application CPU.

Signed-off-by: Georgi Djakov <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Bjorn Andersson <[email protected]>
Signed-off-by: Jassi Brar <[email protected]>

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