[assembly] Add harware_revision to partitions config

This field is now required with fxrev.dev/677925.

Bug: 97960
Change-Id: Ie5471138b64f5bf4aa651aa2f1fe2e443b1b49e4
Reviewed-on: https://fuchsia-review.googlesource.com/c/workstation/+/678202
Reviewed-by: Jiaming Li <lijiaming@google.com>
Commit-Queue: Jiaming Li <lijiaming@google.com>
Fuchsia-Auto-Submit: Aidan Wolter <awolter@google.com>
diff --git a/src/product/partitions_template.json b/src/product/partitions_template.json
index c5527c5..1d21a05 100644
--- a/src/product/partitions_template.json
+++ b/src/product/partitions_template.json
@@ -1,4 +1,5 @@
 {
+  "hardware_revision": "workstation",
   "bootloader_partitions": [
     {
       "name": "bootloader",
@@ -23,4 +24,4 @@
       "slot": "A"
     }
   ]
-}
\ No newline at end of file
+}