Really bump ABI to 2

debian/changelog

@@ -381,9 +381,6 @@ linux (4.15.9-1) UNRELEASED; urgency=medium
     - scsi: mpt3sas: wait for and flush running commands on shutdown/unload
     - [x86] KVM: fix backward migration with async_PF
 
-  [ Salvatore Bonaccorso ]
-  * Add ABI reference for 4.15.0-1
-
   [ Ben Hutchings ]
   * aufs: gen-patch: Fix Subject generation to skip SPDX-License-Identifier
   * aufs: Update support patchset to aufs4.15-20180219 (no functional change)
@@ -396,6 +393,7 @@ linux (4.15.9-1) UNRELEASED; urgency=medium
     (Closes: #888405)
   * nospec: Kill array_index_nospec_mask_check()
   * amdgpu: Abort probing if firmware is not installed, as we do in radeon
+  * Bump ABI to 2
 
   [ Uwe Kleine-König ]
   * netfilter: enable NFT_FIB_NETDEV as module

debian/config/defines

@@ -1,5 +1,5 @@
 [abi]
-abiname: 1
+abiname: 2
 ignore-changes:
  __cpuhp_*
  __xive_vm_h_*