the flag used by kfd is not actually related to fbcon, it just happens
to align.  Use the runpm flag instead so that we can decouple it from
the fbcon flag.

v2: fix resume as well
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: NRajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Acked-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>