lrdp-v2: setting kimage_voffset to null

        In case of 32bit ramdump kimage_voffset will not be used in ramparser.
        In upstream kernel 4.14 this variable got added and set to some address.
        Due to that in case of 32 bit all calculation went worng. So forcefully setting to null if it is 32 bit dump

Change-Id: Ia341074ebfd0811543cc3a2e77d2b23ade43d520