drm/xe: Simplify setting release info in xe->info

Now that we have all IPs being described via struct xe_ip, where release
information (version and name) is represented in a single struct type,
we can extract duplicated logic from handle_pre_gmdid() and
handle_gmdid() and apply it in the body of xe_info_init().

With this change, there is no point in keeping handle_pre_gmdid()
anymore, so we just remove it and inline the assignment of
{graphics,media}_ip.

Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250221-xe-unify-ip-descriptors-v2-7-5bc0c6d0c13f@intel.com


Signed-off-by: Matt Roper <matthew.d.roper@intel.com>