msm: mpq8092: Support to fetch Ethernet MAC address

Add support to read the Ethernet MAC address from the efuse registers
and populate the ethernet device mac-address field in the device tree.

Change-Id: I944d66658b03b5d3292d583327ee949f4492a20b
Signed-off-by: Niranjana Vishwanathapura <nvishwan@codeaurora.org>