drm/i915/perf: Move OA regs to their own header

The OA unit registers are only used by the perf code; move them to their
own header file.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220127234334.4016964-2-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gvt/scheduler.c

@@ -43,6 +43,7 @@
 
 #include "i915_drv.h"
 #include "i915_gem_gtt.h"
+#include "i915_perf_oa_regs.h"
 #include "gvt.h"
 
 #define RING_CTX_OFF(x) \

drivers/gpu/drm/i915/i915_perf.c

@@ -208,6 +208,7 @@
 
 #include "i915_drv.h"
 #include "i915_perf.h"
+#include "i915_perf_oa_regs.h"
 
 /* HW requires this to be a power of two, between 128k and 16M, though driver
  * is currently generally designed assuming the largest 16M size is used such