Add pixfwupdate user/group for pix_tpfwup update touchpad firmware

BUG=none
TEST=Pixart touchpad firmware update

Change-Id: I78c733be1d788d30e27afb0bf6c17dce58ec2426
Reviewed-on: https://chromium-review.googlesource.com/1198813
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Hao He <hao.he@bitland.corp-partner.google.com>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Reviewed-by: Hao He <hao.he@bitland.corp-partner.google.com>
diff --git a/profiles/base/accounts/group/pixfwupdate b/profiles/base/accounts/group/pixfwupdate
new file mode 100644
index 0000000..e8961aa
--- /dev/null
+++ b/profiles/base/accounts/group/pixfwupdate
@@ -0,0 +1,3 @@
+group:pixfwupdate
+gid:20129
+users:pixfwupdate
diff --git a/profiles/base/accounts/user/pixfwupdate b/profiles/base/accounts/user/pixfwupdate
new file mode 100644
index 0000000..6c47aad
--- /dev/null
+++ b/profiles/base/accounts/user/pixfwupdate
@@ -0,0 +1,6 @@
+user:pixfwupdate
+uid:20129
+gid:20129
+gecos:user for pixart tools to update touch devices
+home:/dev/null
+shell:/bin/false