verilog-indent-level-declaration

verilog-indent-level-declaration is a variable defined in `verilog-mode.el'.
Its value is

3

• This variable is safe as a file local variable if its value
  satisfies the predicate `integerp'.

Documentation:
Indentation of declarations with respect to containing block.
Set to 0 to get them list right under containing block.

You can customize this variable.