build: scripts/config - update to kconfig-v5.14

Functional Changes
---------- -------
- make 'imply' not impose any restrictions: allow symbols implied by y
  to become m
- change "modules" from sub-option to first-level attribute

Bugfixes
--------
- nconf: fix core dump when searching in empty menu
- nconf: stop endless search loops
- xconfig: fix content of the main widget
- xconfig: fix support for the split view mode

Other Changes
----- -------
- highlight xconfig 'comment' lines with '***'
- xconfig: navigate menus on hyperlinks
- xconfig: drop support for Qt4
- improve host ncurses detection

Update the 'option modules' usage to just 'modules' in Config.in.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

scripts/config/README

@@ -1,7 +1,6 @@
-These files were taken from the Linux Kernel Configuration System at commit
-089b7d890f972f6b649fedc9259f6b93a18fb970 (Feb 4, 2020) and modified for the
-OpenWrt Buildroot:
- - Removed gconf, tests and kernel configuration targets.
+These files were taken from the Linux 5.14 Kernel Configuration System and
+modified for the OpenWrt Buildroot:
+ - Removed nconf, gconf, tests and kernel configuration targets.
  - Adjusted the Makefile to compile outside the kernel.
  - Always use default file when running make all{no,mod,yes}config.
  - Added a 'reset' command to reset config when the target changes.
@@ -24,4 +23,4 @@ OpenWrt Buildroot:
    BUILD_SHIPPED_FILES defined
 
 For a full list of changes, see the repository at:
-https://github.com/cotequeiroz/linux/commits/openwrt/scripts/kconfig
+https://github.com/cotequeiroz/linux/commits/openwrt-5.14/scripts/kconfig