re-introduce configurations for experimentation

There can be useful when experimenting with Android like boot systems. Re-enable them after mistakenly dropping them in the last upgrade: CONFIG_ANDROID_AB=y
CONFIG_CMD_ABOOTIMG=y
CONFIG_CMD_AB_SELECT=y
CONFIG_CMD_ADTIMG=y
CONFIG_CMD_BCB=y
CONFIG_CMD_GPT=y
CONFIG_PARTITION_TYPE_GUID=y

Signed-off-by: Eric Chanudet echanude@redhat.com