editorconfig: move OpenCL configuration to root

All of the OpenCL files in mesa use 3-space indentation. Move the
editorconfig configuration for this to the root so that supported
editors will pick this up automatically.

Signed-off-by: Olivia Lee <olivia.lee@collabora.com>
Reviewed-by: Mary Guillemard <mary@mary.zone>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37046>

.editorconfig

@@ -8,7 +8,7 @@ charset = utf-8
 insert_final_newline = true
 tab_width = 8
 
-[*.{c,h,cpp,hpp,cc,hh,y,yy}]
+[*.{c,h,cpp,hpp,cc,hh,y,yy,cl}]
 indent_style = space
 indent_size = 3
 max_line_length = 78

src/asahi/.editorconfig

@@ -1,4 +0,0 @@
-[*.cl]
-indent_style = space
-indent_size = 3
-max_line_length = 78