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[Why] For debugging underflow issues it can be useful to have asserts when the underflow initially occurs. [How] Read the underflow status registers after actions that have a high risk of causing underflow and assert that no underflow occurred. If underflow occurred, clear the bit. Signed-off-by: Thomas Lim <Thomas.Lim@amd.com> Reviewed-by: Eric Yang <eric.yang2@amd.com> Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>