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>
diff --git a/configs/mt8183_evb_android_ab_defconfig b/configs/mt8183_evb_android_ab_defconfig
index a4cf4c7..0fee88f 100644
--- a/configs/mt8183_evb_android_ab_defconfig
+++ b/configs/mt8183_evb_android_ab_defconfig
@@ -15,6 +15,7 @@
 # CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
 CONFIG_DEFAULT_FDT_FILE="mt8183-evb"
 # CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_ANDROID_AB=y
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_BDI is not set
 # CONFIG_CMD_CONSOLE is not set
@@ -42,6 +43,7 @@
 # CONFIG_CMD_ITEST is not set
 # CONFIG_CMD_SOURCE is not set
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_AB_SELECT=y
 # CONFIG_CMD_BLOCK_CACHE is not set
 # CONFIG_CMD_MISC is not set
 CONFIG_CMD_EXT4=y