libhsakmt: add RAS support v2

RAS feature enabling bit and errors return are implemented in
existed topology and event mechanism.

v2: change library interface.

Change-Id: I75807c080b5b26e8115240b05b3d7016cb05a31a
Signed-off-by: Eric Huang <JinhuiEric.Huang@amd.com>

include/linux/kfd_ioctl.h

@@ -285,7 +285,11 @@ struct kfd_hsa_memory_exception_data {
 	struct kfd_memory_exception_failure failure;
 	__u64 va;
 	__u32 gpu_id;
-	__u32 pad;
+	__u32 ErrorType; /* 0 = no RAS error,
+				1 = ECC_SRAM,
+				2 = Link_SYNFLOOD (poison),
+				3 = GPU hang (not attributable to a specific cause),
+				other values reserved */
 };
 
 /* hw exception data */