msm: barriers: Add explicit #include <mach/memory.h>

Latest ARM toolchains complains about the
write_to_strongly_ordered_memory() function's implicit
declaration if the mach/memory.h is not included.

Change-Id: I949c1aee7333c7823f868218d3392147e442c4ba
Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/barriers.h b/arch/arm/mach-msm/include/mach/barriers.h
index 919186b..2d4792c 100644
--- a/arch/arm/mach-msm/include/mach/barriers.h
+++ b/arch/arm/mach-msm/include/mach/barriers.h
@@ -10,6 +10,8 @@
  * GNU General Public License for more details.
  *
  */
+#include <mach/memory.h>
+
 #define mb() do \
 	{ \
 		dsb();\