ARM: dts: qcom: Move some pm660 devices into overlays for sdm670

Move the pm660 device nodes such as charger, fuel gauge, haptics
and display-bias into board specific device tree overlay files.
This ensures that these optional devices do not show up in the
base sdm670 device tree.

Also add device files to support pm660a based sdm670 platform.

CRs-Fixed: 2106445
Change-Id: I0ef29089db115bc2476c22d40e40a52e14e5b157
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>