ARM: dts: msm: Disable secondary usb controller for KONA-7230

Disable usb secondary controller from dtsi to allow system
to enter lpm for  qcs7230 iot rb5 devices as with secondary
port enabled due to its internal hub, usb secondary port is
not going to lpm and system Tcxo Count is not incrementing.

Change-Id: I4b42f92053d3a0e3700232f61350c6adab72a3af