drm/xe: Define xe_ip instances before xe_device_desc

drm/xe: Define xe_ip instances before xe_device_desc

We will soon update the code so that pre-GMDID IPs are also defined with
struct xe_ip. Since we will need to refer to them in instances of
struct xe_device_desc, let's move up the current instances of xe_ip
(GMDID-based) so that all IP descriptors are kept together.

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-v2-4-5bc0c6d0c13f@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>