drm/amdkfd: Fix kfd init stack dump

amdkfd is dumping a stack during initialization.
kfd_procfs_add_sysfs_stats is being called twice.  This removes one of
them.

Fixes: 4327bed2 ("drm/amdkfd: Add process eviction counters to sysfs")
Reviewed-by: Kent Russell <kent.russell@amd.com>
Signed-off-by: Philip Cox <Philip.Cox@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>