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simple test of mapping many system memory to gpu.
before
[ RUN      ] KFDMemoryTest.MMap
[          ] Using ISA for GFXIP 9.0
[          ] successfully register/map 32GB system memory to gpu
[       OK ] KFDMemoryTest.MMap (36932 ms)

after
[ RUN      ] KFDMemoryTest.MMap
[          ] Using ISA for GFXIP 9.0
[          ] successfully register/map 32GB system memory to gpu
[       OK ] KFDMemoryTest.MMap (11441 ms)

So there is 11s VS 36s improvement.

Looks like we can do something similar with vm_area too.

Change-Id: I0349aacdeddec3534016d28176f0fabf632c61fc
Signed-off-by: xinhui pan <xinhui.pan@amd.com>