[device] Update Arista drivers submodule (#1533)

Staphylo · lguohan · commit 9f3d3f158312 · 2018-03-27T02:14:16.000-07:00
Enforce SMBus retry for all kinds of IO error as they are generally
one off errors.
diff --git a/platform/broadcom/sonic-platform-modules-arista b/platform/broadcom/sonic-platform-modules-arista
@@ -1 +1 @@
-Subproject commit 3e8345b5d2ec2a2127c201c7749b9283b8daa618
+Subproject commit 6fe9de4dd52bba4c5856567a8f5624e75e9af66d
