VOL-705 Remove ALPH vendor_id as its already in broadcom_onu and can cause a conflict.

Change-Id: I8d3d358661a76f5883c82c0c4bbdafefe1c3d60d
diff --git a/voltha/adapters/brcm_openomci_onu/brcm_openomci_onu.py b/voltha/adapters/brcm_openomci_onu/brcm_openomci_onu.py
index 9424bba..1e640b2 100644
--- a/voltha/adapters/brcm_openomci_onu/brcm_openomci_onu.py
+++ b/voltha/adapters/brcm_openomci_onu/brcm_openomci_onu.py
@@ -51,7 +51,7 @@
     supported_device_types = [
         DeviceType(
             id=name,
-            vendor_ids=['OPEN', 'ALCL', 'ALPH'],
+            vendor_ids=['OPEN', 'ALCL'],
             adapter=name,
             accepts_bulk_flow_update=True
         )