msm: mhi_dev: Add UCI channel

Add MBIM channels 12 and 13 among the UCI channel lists
so these are exposed as device nodes for MBIM clients
to transfer data.

Change-Id: I1f8dbc94cde39adc3a13297c4ceb2060e7991d81
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>