msm: display: include msm-specific ion header

All msm_ion clients need to use <linux/msm_ion.h> instead of
<linux/ion.h>

Change-Id: I7b5390d7cb9cb5b03227b77def248c48b7bc7fa2
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
diff --git a/drivers/char/msm_rotator.c b/drivers/char/msm_rotator.c
index 3ea5efa..729ac10 100644
--- a/drivers/char/msm_rotator.c
+++ b/drivers/char/msm_rotator.c
@@ -28,7 +28,7 @@
 #include <linux/file.h>
 #include <linux/major.h>
 #include <linux/regulator/consumer.h>
-#include <linux/ion.h>
+#include <linux/msm_ion.h>
 #ifdef CONFIG_MSM_BUS_SCALING
 #include <mach/msm_bus.h>
 #include <mach/msm_bus_board.h>