Add back a slightly modified version of the lowlevel settings which
where removed with r46920.
In compare to the old lowlevel settings, the B43c tone is added to
tone_adsl_b and tone_adsl_bv.
If an unsupported tone value is used, the auto probing mode is used, in
compare to the fallback to tone_adsl_av and tone_vdsl_av with the old
lowlevel settings.
Signed-off-by: Mathias Kresin <openwrt@kresin.me>
SVN-Revision: 48054
dc69b89c24