[VCS] Lint Warning

Created by: zarubaf

Warning-[ENUMASSIGN] Illegal assignment to enum variable
ariane/src/lsu.sv, 556
lsu_bypass, "mem_n = '{default:0};"
  Only expressions of the enum type can be assigned to an enum variable. 
  The type int is incompatible with the enum 'fu_t'
  Expression: 0
  Use the static cast operator to convert the expression to enum type.

There are a couple of '{default:0}; assignments. Search and replace with appropriate type.