drm/amd/display: Add dc interface to log pre os firmware information

drm/amd/display: Add dc interface to log pre os firmware information

[Why]
Pre os firmware information is useful to debug pre os to post os fw
transition issues.

[How]
Add dc interface dc_log_preos_dmcub_info() to log pre os firmware
information.

Reviewed-by: Cruise Hung <cruise.hung@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>