add sisfwupdate user/group for sis tools to update touch devices

BUG=none
TEST=SiS touch firmware update

Change-Id: I9f0d7e4038f6e0c40dac00be15ae49de9c73730b
Reviewed-on: https://chromium-review.googlesource.com/1051432
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Andrew de los Reyes <adlr@chromium.org>
Reviewed-by: Andrew de los Reyes <adlr@chromium.org>
diff --git a/profiles/base/accounts/group/sisfwupdate b/profiles/base/accounts/group/sisfwupdate
new file mode 100644
index 0000000..7ceb682
--- /dev/null
+++ b/profiles/base/accounts/group/sisfwupdate
@@ -0,0 +1,3 @@
+group:sisfwupdate
+gid:20113
+users:sisfwupdate
diff --git a/profiles/base/accounts/user/sisfwupdate b/profiles/base/accounts/user/sisfwupdate
new file mode 100644
index 0000000..53b661b
--- /dev/null
+++ b/profiles/base/accounts/user/sisfwupdate
@@ -0,0 +1,6 @@
+user:sisfwupdate
+uid:20113
+gid:20113
+gecos:user for sis tools to update touch devices
+home:/dev/null
+shell:/bin/false