zygo: add 'config-kernel' script to run 'make oldconfig' with KCONFIG_NOTIMESTAMP

(cherry picked from commit 4cc38d103bc42929ef42f3df5a344b27ab3fda45)

diff --git a/zygo/config-kernel b/zygo/config-kernel
new file mode 100755 (executable)
index 0000000..abe750f
--- /dev/null
+++ b/zygo/config-kernel
@@ -0,0 +1,3 @@
+#!/bin/sh
+set -x
+KCONFIG_NOTIMESTAMP=1 make -j oldconfig && git add -f .config && git commit