[Add] 打通Kconfiglib配置操作

scripts/kconfig/Kconfiglib/examples/defconfig_oldconfig.py

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+# Produces exactly the same output as the following script:
+#
+# make defconfig
+# echo CONFIG_ETHERNET=n >> .config
+# make oldconfig
+# echo CONFIG_ETHERNET=y >> .config
+# yes n | make oldconfig
+#
+# This came up in https://github.com/ulfalizer/Kconfiglib/issues/15.
+#
+# Usage:
+#
+#   $ make [ARCH=<arch>] scriptconfig SCRIPT=Kconfiglib/examples/defconfig_oldconfig.py
+
+import sys
+
+import kconfiglib
+
+
+kconf = kconfiglib.Kconfig(sys.argv[1])
+
+# Mirrors defconfig
+kconf.load_config("arch/x86/configs/x86_64_defconfig")
+kconf.write_config()
+
+# Mirrors the first oldconfig
+kconf.load_config()
+kconf.syms["ETHERNET"].set_value(0)
+kconf.write_config()
+
+# Mirrors the second oldconfig
+kconf.load_config()
+kconf.syms["ETHERNET"].set_value(2)
+for s in kconf.unique_defined_syms:
+    if s.user_value is None and 0 in s.assignable:
+        s.set_value(0)
+
+# Write the final configuration
+print(kconf.write_config())