util:nanotool: add kAppIdVendorSTMicro vendor code

Define the vendor code used by STMicroelectronics.

Change-Id: Ie19c61fdfab49cd29709dd7e95bbe0e6db009f6f
Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
diff --git a/util/nanotool/apptohostevent.h b/util/nanotool/apptohostevent.h
index f4c6b45..d79c44f 100644
--- a/util/nanotool/apptohostevent.h
+++ b/util/nanotool/apptohostevent.h
@@ -58,6 +58,7 @@
 }
 
 constexpr uint64_t kAppIdVendorGoogle = 0x476f6f676cULL; // "Googl"
+constexpr uint64_t kAppIdVendorSTMicro = 0x53544d6963ULL; // "STMic"
 
 constexpr uint64_t kAppIdBoschBmi160Bmm150 = MakeAppId(kAppIdVendorGoogle, 2);
 constexpr uint64_t kAppIdBoschBmp280       = MakeAppId(kAppIdVendorGoogle, 5);