ARM: dts: msm: enable real AOP QMP clock control

Update the clock_aop device with functional compatible string
as well as mailbox properties.  This ensures that consumer
requests for the QDSS clock actually affect the QDSS clock
state in hardware.

Change-Id: I0c4f6df525e1f400b4023e76d1ddc2c4e0484f38
Signed-off-by: David Collins <collinsd@codeaurora.org>