disp: msm: remove stale ION references

After adapting dma buf api's these references and
paths are unusable. Clean it up.

Change-Id: Id6fa76945132e312e8bacf6e430633b0db9e48a3
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>

msm/msm_gem.h

@@ -25,8 +25,7 @@
 /* Additional internal-use only BO flags: */
 #define MSM_BO_STOLEN        0x10000000    /* try to use stolen/splash memory */
 #define MSM_BO_KEEPATTRS     0x20000000    /* keep h/w bus attributes */
-#define MSM_BO_SKIPSYNC      0x40000000    /* skip dmabuf cpu sync */
-#define MSM_BO_EXTBUF        0x80000000    /* indicate BO is an import buffer */
+#define MSM_BO_EXTBUF        0x40000000    /* indicate BO is an import buffer */
 
 struct msm_gem_object;