ARM: dts: msm: Add smb2 charger for PM660

This is the device tree node of the QPNP SMB2
charger supported on PM660.

CRs-Fixed: 2076000
Change-Id: I90221cff8ed91c302b0db742346fbc9d2026bc0f
Signed-off-by: Ankit Sharma <ansharma@codeaurora.org>
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>