drm/xe/xe_sysctrl: Add ABI and mailbox interface headers

Add ABI definitions, mailbox API, and command data structures required
for System Controller communication.

No functional changes. This patc

drm/xe/xe_sysctrl: Add ABI and mailbox interface headers

Add ABI definitions, mailbox API, and command data structures required
for System Controller communication.

No functional changes. This patch introduces definitions for mailbox
communication.

Signed-off-by: Anoop Vijay <anoop.c.vijay@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Link: https://patch.msgid.link/20260327131837.2192929-12-anoop.c.vijay@intel.com

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