Use drm render device to map kfd BOs

Previously kfd device is used to map memory for CPU access.
However this is not compatible with how TTM handles CPU mapping
on eviction - memory won't be unmapped and remapped on restore.
This fixes the issue by mmapping memory using DRM render device.

This patch requires a coordinated kernel driver change to work.
To make it compatible with old kernel driver, some temporary codes
are included. Once the coordinated kernel driver is checked in,
the temporary codes can be removed.



Change-Id: Ie7b304c4a82b7e8d5ab703acb81d66430af4f0bc
Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>

include/hsakmttypes.h

@@ -247,7 +247,7 @@ typedef struct _HsaNodeProperties
     HSAuint64       LocalMemSize;       // Local memory size
     HSAuint32       MaxEngineClockMhzFCompute;  // maximum engine clocks for CPU and
     HSAuint32       MaxEngineClockMhzCCompute;  // GPU function, including any boost caopabilities,
-
+    HSAint32        DrmRenderMinor;             // DRM render device minor device number
     HSAuint16       MarketingName[HSA_PUBLIC_NAME_SIZE];   // Public name of the "device" on the node (board or APU name).
                                        // Unicode string
     HSAuint8        AMDName[HSA_PUBLIC_NAME_SIZE];   //CAL Name of the "device", ASCII