config: don't require .config.2 to save a sample

Samples should contain kconfig-parsable definitions, not script variables.
.config.2 contains bash arrays, which is definitely not kconfig-safe...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 reporter_name="Remy Bohmer"

 reporter_url="linux@bohmer.net"

 reporter_comment="Example for building a toolchain for m68000 bare metal targets"