ARM: dts: msm: update smmu configuration for scuba

Remove regulator details for RT and NRT TBUs for scuba. These TBUs are not
power collapsible and hence no need for regulator vote before accessing
tbu registers.

Change-Id: Ia25bbdae756d5fd663684f1348e3f0bc94934b43
Fixes: 174dcab0 ("ARM: dts: msm: add bus scaling & gdsc info for scuba apps smmu")