msm: smd: fix in-tree compilation

In-tree compilation for arch/arm/mach-msm/smd_init_dt.c was hitting this
error:

arch/arm/mach-msm/smd_init_dt.c:24:25: fatal error: smd_private.h: No such
file or directory
 #include <smd_private.h>

This was due to using <> instead of "" style include.

Change-Id: I462d259410377244cd551db910df9e15521544ed
Signed-off-by: Kumar Gala <galak@codeaurora.org>