Google Nest Team: Update regarding recent changes to speaker groups for Nest speakers, displays, and Chromecast

cross-posted from: https://lemdro.id/post/2157354 (!google@lemdro.id)

• Change made to allow devices to belong to only one speaker group at a time is being reversed.
• Legal decision invalidated two patents Sonos claimed were infringed, prompting this reversal.
• Devices will again be able to belong to multiple speaker groups without error.
• Update rolling out immediately on Android and soon on iOS.