blue: mint: enable dcvs

Change-Id: Iac3e2bce5fa3a472c2f6a5d4bfe5a07bf4181cc7
cpufreq: tune up conservative governer

* brings into line with find5 to allow for the possiblilty of setting this as default

Change-Id: I2ee6266699749b58630fbb892538d2d6e30d02c5