ARM: dts: msm: disable OSM secure programming for msmcobalt

Remove the qcom,osm-no-tz flag from the OSM clock device
to prevent the clock-osm driver from initializing registers
which are normally programmed by the secure world.

Change-Id: Iadcbba42eeae1f4e8b4a43e0bf833eaa7e96afd5
CRs-Fixed: 992982
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>