fix(st): setting default KEY_SIZE

Setting default KEY_SIZE to 256 for ECDSA since it is currently being
set to 2048 by make_helpers/defaults.mk, which is an invalid size for
ECDSA

Change-Id: I4c0edf714dcd2a31d5e50ea060b1b5348167387d
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
1 file changed