ARM: dts: da850: Add cfgchip syscon node

Add a syscon node for the SoC CFGCHIPn registers. It includes a child node
for the USB PHY that is part of this range of registers.

Signed-off-by: David Lechner <david@lechnology.com>
[nsekhar@ti.com: drop OF_DEV_AUXDATA() addition]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>