builder: Add support for Olimex A20-OLinuXino-MICRO-eMMC
Those who have the eMMC version of the board, could be interested to be able to use this extra space even if freedombox is not currently using it.
For the record, I came to this change while testing a u-boot change that enable reboot on Olimex A20 micro.
Relate-to: debian/u-boot!34 (merged) Forwarded: https://salsa.debian.org/freedombox-team/freedom-maker.git/pulls?q=author%3Arzr Signed-off-by: Philippe Coval rzr@users.sf.net