drm/radeon: make fence wait in suballocator uninterrruptable

Commit 254986e3 ("drm/radeon: Use the drm suballocation manager implementation.")
made the fence wait in amdgpu_sa_bo_new() interruptible but there is no
code to handle an interrupt. This caused the kernel to randomly explode
in high-VRAM-pressure situations so make it uninterruptible again.

Fixes: 254986e3 ("drm/radeon: Use the drm suballocation manager implementation.")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2769


Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org # 6.4+
CC: Simon Pilkington <simonp.git@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230906195517.1345717-1-alexander.deucher@amd.com


Signed-off-by: Christian König <christian.koenig@amd.com>