arm64: dts: amlogic: meson-sm1-bananapi-m5: fix adc keys node names

Fixes:
adc_keys: 'key' does not match any of the regexes: '^button-', 'pinctrl-[0-9]+'

Also fix the invalid "adc_keys" node name.

Link: https://lore.kernel.org/r/20230124-b4-amlogic-bindings-fixups-v1-11-44351528957e@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>