flashchips.c: Take at49f020 changes from upstream

Make flashchips.c entry for Atmel AT49F020 match upstream.

Also takes printlock_at49 from upstream.

Note: upstream set page_size to 0 in commit
8dd97f9c9e01a01cfd84ebbeb1bb936b55cb017a "Add support for Atmel
AT49(H)F010, AT49F080 and AT49F080T" by ziltro@ziltro.com 2012-08-14.

BRANCH=None
BUG=chromium:478356
TEST=Built flashrom and ran flashrom -L

Change-Id: I8737ac3322fd0f7f6351349b0b4c9082f92ec650
Signed-off-by: Alan Green <avg@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/1778451
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
3 files changed