toolchain: move elf2flt+mklibs under 'Common Toolchain Options'

toolchain/Config.in.2

@@ -8,11 +8,11 @@ source "toolchain/binutils/Config.in"
 source "toolchain/gcc/Config.in"
 source "toolchain/ccache/Config.in"
 source "toolchain/gdb/Config.in"
-source "toolchain/elf2flt/Config.in"
-source "toolchain/mklibs/Config.in"
 
 comment "Common Toolchain Options"
 
+source "toolchain/elf2flt/Config.in"
+source "toolchain/mklibs/Config.in"
 source "toolchain/sstrip/Config.in"
 
 config BR2_ENABLE_MULTILIB