arm/dt: 8610: Enable support for vdd min without phy retention

Add device tree entry for enabling support for allowing vdd
minimization without putting phy into retention. This will
avoid power consumption due to leakage current seen on 8610
platform.

Change-Id: I228068e0288a21e7a2629d89bb94656c484e490e
Signed-off-by: Saket Saurabh <ssaurabh@codeaurora.org>