init-live.sh: remove the '-c /dev/console' for switch_root

init-live.sh: remove the '-c /dev/console' for switch_root

The '-c DEV' option is specific to the switch_root provided by busybox.
switch_root from util-linux doesn't recognize this option. As a result,
if we we this init-live.sh script together with util-linux, we would get
a kernel panic when executing switch_root.

Besides, this option doesn't seem to have any useful effect as far as I
can see. Removing it doesn't affect the behaviours of our live images.

(From OE-Core rev: 6f50ccb8ae9e11870f99bb3b191f677c3633cd0d)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>