armv8: lx2160: Drop useless CONFIG_CMDLINE_EDITING from config.h

armv8: lx2160: Drop useless CONFIG_CMDLINE_EDITING from config.h

commit b74c640fe5a1 ("armv8: lx2160ardb : Add support for LX2160ARDB
platform") brought a new boards support with redundancy in the config.h.

One of them is CONFIG_CMDLINE_EDITING which is removed by this change.

Cc: Priyanka Jain <priyanka.jain@nxp.com>
Cc: Peng Ma <peng.ma@nxp.com>
Cc: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>