drm/amdkfd: update GFX11 CWSR trap handler

With corresponding FW change fixes issue where triggering CWSR on a
workgroup with waves in s_barrier wouldn't lead to a back-off and
therefore cause a hang.

Signed-off-by: Jay Cornwall <[email protected]>
Tested-by: Graham Sider <[email protected]>
Acked-by: Harish Kasiviswanathan <[email protected]>
Acked-by: Felix Kuehling <[email protected]>
Reviewed-by: Graham Sider <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: jcornwallAMD