UBUNTU: [Config] set CONFIG_AD9467=n and CONFIG_ADI_AXI_ADC=n for amd64

UBUNTU: [Config] set CONFIG_AD9467=n and CONFIG_ADI_AXI_ADC=n for amd64

BugLink: https://bugs.launchpad.net/bugs/1923069
Upstream stable commit "iio: adc: adi-axi-adc: add proper Kconfig
dependencies" adds a dependency on CONFIG_OF for CONFIG_ADI_AXI_ADC.
CONFIG_OF is disabled for amd64, yet it seems that a select from
CONFIG_AD9467 is keeping it enabled in our configs. As far as I can
tell CONFIG_AD9467 isn't needed on amd64, so disable it.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>