build: scripts/config - update to kconfig-v5.6

Major changes include:
 - Much more readable reverse dependencies separated in groups
 - Improved recursive dependency report
 - More readable .config files: add comments to signal end of menus
 - More warnings for incorrect Config.in entries, such as a 'choice'
   default not contained in the 'choice'
 - Hability to properly display pseudographics with non-latin locales
 - Recursive dependencies are now treated as errors - this should make
   it harder for them to creep in.

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

scripts/config/.gitignore

@@ -1,15 +1,14 @@
-*.o
-conf*
-!conf*.c
-!conf*.h
-mconf*
-!mconf*.c
-!mconf*.h
-mconf_check
-*.*.c
-qconf*
-qconf*.moc
-!qconf*.cc
-!qconf*.h
-!images*.c
-.tmp_qtcheck
+#
+# Generated files
+#
+*.moc
+*conf-cfg
+
+#
+# configuration programs
+#
+conf
+mconf
+nconf
+qconf
+gconf