Add u2f to group tss

U2fd needs to talk with trousers to perform u2f commands on generic tpm
devices. Add user u2f to group tss.

BUG=b:205813697
TEST=None

Cq-Depend: chromium:3403467, chromium:3474256
Change-Id: I8c87e5500fc52f5011cc4dec95006f3296a2e031
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/3386752
Reviewed-by: Andrey Pronin <apronin@chromium.org>
Reviewed-by: Mattias Nissler <mnissler@chromium.org>
Tested-by: Howard Yang <hcyang@google.com>
Commit-Queue: Howard Yang <hcyang@google.com>
diff --git a/profiles/base/accounts/group/tss b/profiles/base/accounts/group/tss
index 224ecd4..bc2f85c 100644
--- a/profiles/base/accounts/group/tss
+++ b/profiles/base/accounts/group/tss
@@ -1,4 +1,4 @@
 group:tss
 gid:207
 # Only certain users are allowed to talk to the TPM via tcsd.
-users:root,chaps,attestation,tpm_manager,trunks,bootlockboxd,oobe_config_save,oobe_config_restore
+users:root,chaps,attestation,tpm_manager,trunks,bootlockboxd,u2f,oobe_config_save,oobe_config_restore