docs/fingerprint: Add information on fingerprint SKUs
docs/fingerprint: Add information on fingerprint SKUs

BRANCH=none
BUG=none
TEST=view in gitiles

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: Ib9c7ec288c9efabb454580c6bf6028ee6a0a1373
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2721087
Commit-Queue: Craig Hesling <383db090fd8ef907a606ac8a9eccd2962bc489cf@chromium.org>
Reviewed-by: Craig Hesling <383db090fd8ef907a606ac8a9eccd2962bc489cf@chromium.org>

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