buildsys: minor fixes in Makefile.arch for C6X
buildsys: minor fixes in Makefile.arch for C6X

Just a tidy-up by removing commented-out lines.

Signed-off-by: Carmelo Amoroso <532378793705a04edd56deb76ad8c0442834d55d@st.com>

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc