ARM: dts: msm: Remove superfluous include

msm-arm-smmu.dtsi doesn't do anything with clocks, but it's including a
clock header file.  Remove the include since it's unnecessary.

Change-Id: I3ab7d0bfc6153b95e6b412ef90d75aba43cef540
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>