[roll] Roll fuchsia [netdevice] Remove const from MockEthernetImpl

llvm/llvm-project#121419 added
-Wignored-qualifiers diagnostic for cv-qualified base
classes. This patch removes const from MockEthernetImpl
to fix the -Wignored-qualifiers error.

Original-Bug: 391704289
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1192542
Original-Revision: 626de676a7b41c8be75aeb1fb7030735aa3f12d5
GitOrigin-RevId: fda0189e659871a285e713d06da62c0eaf8e7764
Change-Id: Iebcf36703ad221a3099d618e5ed14d9b048576c2

Author: Gulfem Savrun Yeniceri

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="1be5fba4f0ca64570eec5d4e7bc5b6150c1532be"/>
+             revision="626de676a7b41c8be75aeb1fb7030735aa3f12d5"/>
   </projects>
   <hooks>
     <hook name="install-environment"