Android: fix path for GpuSwitches

No change to logic. This moves GpuSwitches to a "gpu/config" subfolder,
to match the Java package name. I overlooked this in the last patchset
of https://crrev.com/c/2343776.

Bug: 1112006
Test: autoninja -C out/Default system_webview_apk
Change-Id: If970753ab1f984ca7377bc6b097877a7b5cf0889
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2351121
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797486}

gpu/config/BUILD.gn

@@ -235,7 +235,7 @@ if (is_android) {
     # External code should depend on ":config_java" instead.
     visibility = [ ":*" ]
     sources = [ "gpu_switches.cc" ]
-    template = "android/java/src/org/chromium/gpu/GpuSwitches.java.tmpl"
+    template = "android/java/src/org/chromium/gpu/config/GpuSwitches.java.tmpl"
   }
 
   android_library("config_java") {