Based on newer qcom kernels, change rmnet_shs_assign and
rmnet_perf_core_deaggregate from void to int.
Add missing argument to rmnet_perf_deag_entry.
Required after "READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE()"
Change-Id: Idc4e844212148f26fb81a5f2287a133bff4c71b5