mhi: dev: uci: inherit IPC log level from controller

Make userspace control interface devices inherit log levels
from the controller to allow level switches to reflect across
MHI clients.

Change-Id: Id8526f11acc1a0852811f9c78d7d7f073aa5c724
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>