ARM: dts: msm: Fix /include/ syntax in msmzirc.dtsi

Since device tree files are now being passed through the C
preprocessor, is is advantageous to use the #include syntax
for handling includes, rather than relying on DTC's include
mechanism.

Change-Id: Ic809bfa2f962401957ff04c97b7c6d78ce4bee0c
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>