configs: meson64_android: reboot to fastbootd from bootloader

Whenever we test for boot-fastboot in the BCB, it means that Android
wants us to boot into recovery with a special mode (fastbootd).

Force reboot into recovery in that case.

Note: we don't erase the bcb on purpose here: recoveryOS needs to read
the BCB as well to know if it boots into regular recovery mode or
fastbootd mode.

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