lantiq: ase: disable adm6996 and swconfig

lantiq: ase: disable adm6996 and swconfig

The ase subtarget supports two devices. ALLNET ALL0333CJ has one
Ethernet port and uses only the built-in MAC and PHY. The second
device is the Netgear DGN1000, which uses an AR8216 switch.

The driver for the adm6996 switch was probably accidentally
enabled instead of the ar8216 in commit that restores ase support
9b321bc60de3 ("lantiq: add Amazon-SE subtarget").

Before removing the ase subtarget, only ar8216 was enabled
c82183639512 ("lantiq: remove unmaintained code").

Reduce uncompressed kernel size by 15.6 kB.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Link: https://github.com/openwrt/openwrt/pull/15332
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>