tests/amdgpu: update gfx9 BufferCopy/BufferClear

buffer_load/store_format_xyzw require 64bit vgpr_a[2].
The original parameter is one u32. Modify the shader binary to
fit the 64bit parameter.

Signed-off-by: Feifei Xu <Feifei.Xu@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Tested-by: Gang Long <Gang.Long@amd.com>