msm: board-copper: Initialize modem_notifier driver during early board init

The modem_notifier driver is a dependency for the SMD driver, which in
turn is a dependency for the power management framework.  All the
dependencies of the power management framework need to be in the early
board init.

Change-Id: I0eafdc0095304f38833527bb170713dba4ca0474
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>