drm/amd/display: only call pmfw if smu present flags true

drm/amd/display: only call pmfw if smu present flags true

[Why & How]
for fault safe case: only call pmfw if smu present flags true
and default to 2 channle for bios intergration info table error.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: James Lin <pinglei.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>