configs: sei610/sei510: set CONFIG_CMD_BCB=y

SEI-610 and SEI-510 are both for Android boards based on Yukawa[1]

Enable the BCB command to enable the standard Android boot flow.

[1] https://android.googlesource.com/device/amlogic/yukawa/


Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>