platform: msm_shared: Use dsb() macro

dsb() is now defined as a macro, remove extern references to
dsb() function & include header file where dsb() is defined
wherever necessary.

Change-Id: I4e31b28a380a9babe3e7b87b239711242d84a270
diff --git a/platform/msm_shared/lvds.c b/platform/msm_shared/lvds.c
index 85ab7fb..0a16c34 100644
--- a/platform/msm_shared/lvds.c
+++ b/platform/msm_shared/lvds.c
@@ -31,6 +31,7 @@
 #include <reg.h>
 #include <err.h>
 #include <bits.h>
+#include <arch/defines.h>
 #include <platform/iomap.h>
 #include <platform/clock.h>
 #include <dev/fbcon.h>