Now that we use kvmalloc for the crat_image, we need to use kvfree when
we destroy this.
Fixes: d0e63b343e575e ("drm/amdkfd: Use kvmalloc instead of kmalloc for VCRAT") Reported-by: Morris Zhang <shiwu.zhang@amd.clm> Signed-off-by: Kent Russell <kent.russell@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>