drm/i915/fb: Rename i915_color_plane_view::stride to mapping_stride

The next patch needs to distinguish between a view's mapping and scanout
stride. Rename the current stride parameter to mapping_stride with the
script below. mapping_stride will keep the same meaning as stride had
on all platforms so far, while the meaning of it will change on ADLP.

No functional changes.

@@
identifier intel_fb_view;
identifier i915_color_plane_view;
identifier color_plane;
expression e;
type T;
@@
struct intel_fb_view {
...
struct i915_color_plane_view {
...
- T stride;
+ T mapping_stride;
...
} color_plane[e];
...
};

@@
struct i915_color_plane_view pv;
@@
  pv.
-    stride
+    mapping_stride

@@
struct i915_color_plane_view *pvp;
@@
  pvp->
-     stride
+     mapping_stride

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211026225105.2783797-6-imre.deak@intel.com