ARM: dts: msm: fix ipa clock name for msmcobalt.dtsi

Update IPA node to map the correct IPA clock.
This is done to avoid IPA clock gating on AP suspend.

Change-Id: Ic10949cd9e1eefffac6d744157e9f2a7df63ba5d
CRs-Fixed: 985868
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>