Revert "ARM: defconfig: Enable ax88796c driver for Exynos boards"

These config options are not introduced until 5.16[1], so they shouldn't
be set in 5.15.

This reverts commit dfe21dca.

[1] a97c69ba



Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>