keygeneration: fix typos in previous commit

Forgot to update the bitsizes in the variable constants.

BUG=chromium:454651
TEST=`./create_new_keys.sh` still generates 8k keys
TEST=`./create_new_keys.sh --4k` now generates 4k keys
BRANCH=None

Change-Id: Ie285649f4d58ad2e2cba71f4cab737cc2235e3ab
Reviewed-on: https://chromium-review.googlesource.com/245890
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed