removed duplicate config.in reference

target/Config.in

@@ -19,7 +19,6 @@ source "target/x86/grub/Config.in"
 source "target/x86/syslinux/Config.in"
 source "target/powerpc/yaboot/Config.in"
 source "target/u-boot/Config.in"
-source "target/device/Atmel/u-boot/Config.in"
 endmenu
 
 menu "Kernel"