Adds IWirelessCharger 1.2 to the Vendor Freeze redfin framework matrix.

This change also marks 1.3 as optional.
Older redfin vendor images only provide 1.2.

Bug: 183502398
Test: build & boot redfin VF with R vendor and S system
Change-Id: I236e961ad9c40ddc5bb30259d56429a56950d345