ARM: dts: Add DT support for EMAC deive on MPQ8092

Add EMAC device node to the MPQ8092 device tree.
Also add default configuration for PMIC_GPIO_14 in the MPQ8092
device tree which is required to pull ethernet PHY out of reset.

Change-Id: I4a72b771e2e40ae082200e223a28c94724fc3566
Signed-off-by: Niranjana Vishwanathapura <nvishwan@codeaurora.org>