ARM: dts: qcom: add DT files to support new Kona MTP power grid

Add device tree files to support new mtp platform subtype with
a different power grid. In the new power grid, WLAN and Bluetooth
chips are powered by regulator S6A instead of S2F.

Change-Id: I66be34787f26f1c3eb773c08b8a98b2b22468918