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DVFS constraints for GPU are applied on gbus not on gpcclk. Make T210 K4.4 use gm20b.gbus to change the GPU clk rates and use its parent clock gbus while querrying DVFS constraints for the GPU. Bug 200233943 Change-Id: I2bad3266d6b8f8f3806a0d4249d9b40308c2ee6a Signed-off-by: Srikar Srimath Tirumala <srikars@nvidia.com> Reviewed-on: http://git-master/r/1275926 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>