.editorconfig: respect .editorconfig settings from parent directories

.editorconfig: respect .editorconfig settings from parent directories

Setting 'root' to 'true' prevents the editor from searching for other
.editorconfig files in parent directories.  However, a common workflow
involves generating a patch with 'git format-patch' and opening it in an
editor within the kernel source directory.  In such cases, we want any
specific settings for patch files defined in an .editorconfig located
above the kernel source directory to remain effective.  Therefore, remove
the 'root' setting from the kernel .editorconfig.

Link: https://lkml.kernel.org/r/20251217-editconfig-v1-1-883e6dd6dbfa@gmail.com
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Cc: Íñigo Huguet <ihuguet@redhat.com>
Cc: Danny Lin <danny@kdrag0n.dev>
Cc: Mickaël Salaün <mic@digikod.net>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>