pw_bluetooth: Add DataBufferOverflowEvent Emboss definition

Test: pw presubmit --step gn_emboss_nanopb_build
Change-Id: Ia3e2d2543f0adc89de9df8342e6fb792d5495913
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/167858
Reviewed-by: Ali Saeed <saeedali@google.com>
Commit-Queue: Ben Lawson <benlawson@google.com>
diff --git a/pw_bluetooth/public/pw_bluetooth/hci_events.emb b/pw_bluetooth/public/pw_bluetooth/hci_events.emb
index 5ff1e93..301d2b6 100644
--- a/pw_bluetooth/public/pw_bluetooth/hci_events.emb
+++ b/pw_bluetooth/public/pw_bluetooth/hci_events.emb
@@ -607,3 +607,10 @@
 
   $next [+1]                          KeyType          key_type
     -- Type of key used when pairing.
+
+
+struct DataBufferOverflowEvent:
+  -- Data Buffer Overflow Event (v1.1) (BR/EDR & LE)
+  let hdr_size = hci.EventHeader.$size_in_bytes
+  0     [+hdr_size]  hci.EventHeader  header
+  $next [+1]         LinkType         ll_type