test/amdgpu: remove static varible in Syncobj test
In syncobj test, wait thread and signal thread create simultaneously. The ptr for GFX IB and SDMA IP should be operated separately. With static, there will be risk that GFX NOP is in SDMA IB or SDMA NOP is in GFX IB, this will lead to GFX or SDMA hang.
Signed-off-by: Jinzhou Su Jinzhou.Su@amd.com