C2Config: correct declaration of tunnel-peek mode

Misuse C2EasyEnum on the delcaration of C2StreamTunnelPeekModeTuning.
Should use C2SimpleValueStruct with C2EasyEnum.

Bug: 264485647

Change-Id: Idd10af02ddbcc8b89358e70e0eda5c660dbf0d2b
1 file changed