Blackfin: bf548-ezkit: bump SPI flash size up

The current size used (256KiB) is smaller than the LDR created for
the bf548-ezkit, so 'run update' doesn't work correctly.  So bump
up the size a bit by making this flexible per-board config.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2 files changed