docs/fingerprint: Remove note about flash_ec workaround
docs/fingerprint: Remove note about flash_ec workaround

flash_ec now consistently works with icetower.

BRANCH=none
BUG=b:177331210
TEST=view in gitiles

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: Id57d53c3779652afe60a555436b4177e27603463
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3926348
Reviewed-by: Bobby Casey <a3c107f0b4efaee07148ab0813ba992bba562a69@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec