drm/amdgpu: Skip TMR allocation if not required

[ Upstream commit 5b03127d ]

On ASICs with PSPv13.0.6, TMR is reserved at boot time. There is no need
to allocate TMR region by driver. However, it's still required to send
SETUP_TMR command to PSP.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 467e00b3 ("drm/amd/amdgpu: Fix missing error return on kzalloc failure")
Signed-off-by: Sasha Levin <sashal@kernel.org>