msm: kgsl: Add ION as an external memory source

Allow ION buffers to be attached via IOCTL_KGSL_MAP_USER_MEM

Change-Id: Ic0dedbada34d12fb70b528f3a93dd21805a4c8a4
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
diff --git a/include/linux/msm_kgsl.h b/include/linux/msm_kgsl.h
index b55cfe1..84e8564 100644
--- a/include/linux/msm_kgsl.h
+++ b/include/linux/msm_kgsl.h
@@ -41,7 +41,8 @@
 enum kgsl_user_mem_type {
 	KGSL_USER_MEM_TYPE_PMEM		= 0x00000000,
 	KGSL_USER_MEM_TYPE_ASHMEM	= 0x00000001,
-	KGSL_USER_MEM_TYPE_ADDR		= 0x00000002
+	KGSL_USER_MEM_TYPE_ADDR		= 0x00000002,
+	KGSL_USER_MEM_TYPE_ION		= 0x00000003,
 };
 
 struct kgsl_devinfo {