msm: kgsl: drm: Increased max sub-buffers allowed to 3

To permit triple buffering, number of allowed sub-buffers
was increased to 3 from 2.

Change-Id: I0d70df7b1ecad438280c9560d9b70354f3681d8f
Signed-off-by: Michael Street <mstreet@codeaurora.org>
diff --git a/include/drm/kgsl_drm.h b/include/drm/kgsl_drm.h
index 41f7c29..2ad1ab2 100644
--- a/include/drm/kgsl_drm.h
+++ b/include/drm/kgsl_drm.h
@@ -86,7 +86,7 @@
 struct drm_kgsl_gem_create_from_ion)
 
 /* Maximum number of sub buffers per GEM object */
-#define DRM_KGSL_GEM_MAX_BUFFERS 2
+#define DRM_KGSL_GEM_MAX_BUFFERS 3
 
 /* Memory types - these define the source and caching policies
    of the GEM memory chunk */