drm/xe: Replace i915 with xe in uapi

All structs and defines had already been renamed to "xe", but some
comments with "i915" were left over. Rename them.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://lore.kernel.org/r/20230313211628.2492587-1-lucas.demarchi@intel.comSigned-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

include/uapi/drm/xe_drm.h

@@ -37,7 +37,7 @@ extern "C" {
  */
 
 /**
- * struct i915_user_extension - Base class for defining a chain of extensions
+ * struct xe_user_extension - Base class for defining a chain of extensions
  *
  * Many interfaces need to grow over time. In most cases we can simply
  * extend the struct and have userspace pass in more data. Another option,
@@ -55,20 +55,20 @@ extern "C" {
  *
  * .. code-block:: C
  *
- *	struct i915_user_extension ext3 {
+ *	struct xe_user_extension ext3 {
  *		.next_extension = 0, // end
  *		.name = ...,
  *	};
- *	struct i915_user_extension ext2 {
+ *	struct xe_user_extension ext2 {
  *		.next_extension = (uintptr_t)&ext3,
  *		.name = ...,
  *	};
- *	struct i915_user_extension ext1 {
+ *	struct xe_user_extension ext1 {
  *		.next_extension = (uintptr_t)&ext2,
  *		.name = ...,
  *	};
  *
- * Typically the struct i915_user_extension would be embedded in some uAPI
+ * Typically the struct xe_user_extension would be embedded in some uAPI
  * struct, and in this case we would feed it the head of the chain(i.e ext1),
  * which would then apply all of the above extensions.
  *
@@ -77,7 +77,7 @@ struct xe_user_extension {
 	/**
 	 * @next_extension:
 	 *
-	 * Pointer to the next struct i915_user_extension, or zero if the end.
+	 * Pointer to the next struct xe_user_extension, or zero if the end.
 	 */
 	__u64 next_extension;
 	/**
@@ -87,7 +87,7 @@ struct xe_user_extension {
 	 *
 	 * Also note that the name space for this is not global for the whole
 	 * driver, but rather its scope/meaning is limited to the specific piece
-	 * of uAPI which has embedded the struct i915_user_extension.
+	 * of uAPI which has embedded the struct xe_user_extension.
 	 */
 	__u32 name;
 	/**
@@ -99,7 +99,7 @@ struct xe_user_extension {
 };
 
 /*
- * i915 specific ioctls.
+ * xe specific ioctls.
  *
  * The device specific ioctl range is [DRM_COMMAND_BASE, DRM_COMMAND_END) ie
  * [0x40, 0xa0) (a0 is excluded). The numbers below are defined as offset