ARM: multi_v7_defconfig: Add support for Airoha EN7523 SoC

This enables basic bootup support for the Airoha EN7523 SoC.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20220130145116.88406-5-nbd@nbd.name


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>