Add CHIP copyright (#4782)
Add CHIP copyright (#4782)

As discussed in https://github.com/project-chip/connectedhomeip/commit/571738df86943a91f86b4270c61f29f2915af441#r46898501.
nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip