move wifi configurations from BoardConfig-common.mk to wifi/BoardConfig-wifi.mk.
So, each project can decide whether it should share the same configurations or create a new one on their own.
Bug: 208159314
Test: ifconfig after attempting STA+SAP concurrency.
Change-Id: Id2474df377f242528be661fefe712d7203cdddf8
Bug: 194132777
Test: connect STA to 2.4GHz and verified that p2p is able to come up in
5GHz DBS mode.
Change-Id: I07fb6b586b89f66fd105673d47b2d2367c30e487
Use default wifi channel 11 if interference from band 40
renders all 2.4GHz wifi channels unsafe for coex.
Bug: 198345384
Test: adb shell cmd wifi set-coex-cell-channels lte 40 2400000 200000 -1
0, verify that coex log does not contain unsafe channel 11
Change-Id: Ifd90ed1846bc9897a88244b5fdc964143c00d702