Limit wifi item edit content's max length to 500 am: 092668676a am: 0a57f0589f am: d80e331ede am: 2f6a54d7de am: 5d7cc10daa

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/27546891

Change-Id: I005572a454c3c809b7658aa7a20f3d7255316051
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>