enable dual sim prop

    /** Enum indicating multisim variants
     *  DSDS - Dual SIM Dual Standby
     *  DSDA - Dual SIM Dual Active
     *  TSTS - Triple SIM Triple Standby
     **/

more info: https://github.com/CyanogenMod/android_frameworks_base/blob/4948cdb6dab9fe726859203b5a6b6bcfff97437e/telephony/java/android/telephony/MSimTelephonyManager.java#L68