[EFL] Use static const insted of #define macro.

[EFL] Use static const insted of #define macro.
https://bugs.webkit.org/show_bug.cgi?id=76499

Reviewed by Hajime Morita.

WebKit coding style prefers const to #define. EFL port needs to use const insted of #define macro.
This patch replace global variables defined by #define with const.

* ewk/ewk_tiled_backing_store.cpp:
(_ewk_tiled_backing_store_smart_add):
(_ewk_tiled_backing_store_zoom_set_internal):
* ewk/ewk_tiled_backing_store.h:
* ewk/ewk_tiled_matrix.cpp:
(ewk_tile_matrix_new):
* ewk/ewk_view.cpp:
(_ewk_view_repaint_add):
(_ewk_view_repaints_flush):
(_ewk_view_scroll_add):
(_ewk_view_scrolls_flush):
(_ewk_view_priv_new):
(ewk_view_base_smart_set):
* ewk/ewk_view_tiled.cpp:
(_ewk_view_tiled_smart_pre_render_start):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105240 268f45cc-cd09-0410-ab3c-d52691b4dbfc