smdk4412-common: use new SAMSUNG_DVFS flag

Change-Id: I28688bc6419d5ee10cd888a5cb1a3dce038f2e7c
Merge "smdk4412-common: use new SAMSUNG_DVFS flag" into cm-10.2
Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_device_samsung_smdk4412-common into cm-10.2