defconfig: mdm: Add sysmon config for MDM9607 target

Adding the system monitor support which is used for
notifying the subsystem within the SOC about other
subsystems state changes.

Change-Id: Ie8e87e2b0081b2ff444a3c65501643c0e70bf038
Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>