drm/xe: Add framework for info probing

drm/xe: Add framework for info probing

Functions xe_info_init_early() and xe_info_init() currently probe some
information from the hardware while doing initialization of info
fields.  Besides mixing responsibilities, another issue from this
approach is that kunit tests need to implement static stubs for the
probing part.

Let's prepare the ground to ensuring that those functions stop probing
the information from the hardware by creating the necessary framework
for extracting the probing bits out of them.  Do that by creating a
new struct type called xe_probed_info and the functions responsible
for populating it.

In upcoming changes, we will gradually refactor the code so that all
info needed by xe_info_init_early() and xe_info_init() that is probed
from the hardware is passed to them via struct xe_probed_info.

Reviewed-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Reviewed-by: Violet Monti <violet.monti@intel.com>
Link: https://patch.msgid.link/20260609-xe-probe-info-v1-1-21e83e188e60@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>