kconfig: use environment option

Use the environment option to provide the ARCH symbol
and the KERNELVERSION symbol.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/init/Kconfig b/init/Kconfig
index 288444b..0d0bbf2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1,3 +1,11 @@
+config ARCH
+	string
+	option env="ARCH"
+
+config KERNELVERSION
+	string
+	option env="KERNELVERSION"
+
 config DEFCONFIG_LIST
 	string
 	depends on !UML