Limit wifi item edit content's max length to 500 am: 09266867 am: 0a57f058...

Limit wifi item edit content's max length to 500 am: 09266867 am: 0a57f058 am: d80e331e am: 2f6a54d7 am: 5d7cc10d

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>