[Fuchsia] Exclude libvk_swiftshader.so on Fuchsia

libvk_swiftsahder.so was pulled on web_engine package after swiftshader
was enabled in Angle. We don't need it so it can be excluded.

Bug: fuchsia:37278
Change-Id: I459385e5c61a2a5eb510aeeecf0f5c7c7d038a75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823040
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699524}

fuchsia/engine/BUILD.gn

@@ -211,6 +211,8 @@ fuchsia_package("web_engine") {
     "lib/libEGL.so",
     "lib/libGLESv2.so",
     "lib/libfuchsia_egl.so",
+    "lib/libvk_swiftshader.so",
+    "swiftshader/libvk_swiftshader_icd.json",
   ]
 }