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