drm/amdkfd: correct amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu log.

it could also be insufficient vram that makes
amdgpu_amdkfd_reserve_mem_limit fail.

Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>