[roll] Roll fuchsia [pci] Pull BusDeviceInterface out into its own file

It needs to grow so splitting it out now for ease of review /
refactoring.

Original-Bug: 32978
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/471477
Original-Revision: 1cb153654210c4f824abff58ace775f2fda62ee5
GitOrigin-RevId: decfbe2de6343120b6240b8f3a0a493d47d57673
Change-Id: I08bf9124b706f2de3c31916c56a59160d874f6bb
diff --git a/stem b/stem
index 93c1f7c..b228bd7 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="8667c01c3877d578b79663d47eac8d15d060dfc3"/>
+             revision="1cb153654210c4f824abff58ace775f2fda62ee5"/>
   </projects>
   <hooks>
     <hook name="install-environment"