Use asynchronous polling to handle umc_v12_0 poisoning.

v2:
  1. Change function name.
  2. Change the debugging information content.
Signed-off-by: YiPeng Chai <YiPeng.Chai@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>