smartreflex: add an nvalue override setting which is used when efuse is missing voltage values (overclock)

Change-Id: Ifa2a18976c74a34b13ec4fff3a2902b16437a854
opp: add 4430 nvalue override for 1.2ghz (when missing)

Change-Id: I37d9d33d2e60a28b928e5075c9b8b9ebe20e93c5