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: 9dfeabd5 am: bc56517f am: 52f79ff2

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



Change-Id: I17adb5badb8ea92de3f9b98ec5a909f50648ce39
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>