configs: mt8183_evb_android_ab_defconfig: enable A/B

This way, we have:
- mt8183_evb_android_ab_defconfig for A/B support
- mt8183_evb_android_defconfig for legacy ota support

Bug: https://baylibre.atlassian.net/browse/RITA-89
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
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