fpsensor: Add help descriptions for console commands
fpsensor: Add help descriptions for console commands

All the other console commands have help descriptions except for the
fingerprint sensor commands.

BRANCH=none
BUG=none
TEST="help list" in hatch_fp console

Change-Id: I601c7e49a28693f4b7f4344a6030febb87c2ae20
Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1674808
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

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