ARM: dts: msm: Enable the linux clock drivers on MSMCOBALT RUMI

Remove the over-rides in place for the clock drivers in order
to enable them on RUMI for MSMCOBALT.

CRs-Fixed: 971162
Change-Id: I5a0e1b8e74f70cadf303694c4c279dd9224e8ec7
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>