ARM: msm: dts: Add a SPI Ethernet controller regulator for APQ8084 CDP

The SPI Ethernet controller found on APQ8084 CDP boards is powered via a
MAX1818EUT33 chip. Add device definition for this.

Change-Id: I4be9471b7835d05690679d0092eac8de6c695a80
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>