fix to unbreak verilator compatability

[hhe07]

move include / local parameter calculation to fix verilator compilation issue

error:

%Error: /home/hhe07/Documents/openrisc/litex/pythondata-cpu-mor1kx/pythondata_cpu_mor1kx/verilog/rtl/verilog/mor1kx_utils.vh:96:18: Constant function may not be declared under generate (IEEE 1800-2023 13.4.3)
                                                                                                                                  : ... note: In instance 'sim.mor1kx.mor1kx_cpu'
   96 | function integer calc_rf_addr_width;
      |                  ^~~~~~~~~~~~~~~~~~
        /home/hhe07/Documents/openrisc/litex/pythondata-cpu-mor1kx/pythondata_cpu_mor1kx/verilog/rtl/verilog/mor1kx_cpu.v:205:1: ... note: In file included from 'mor1kx_cpu.v'
%Error: /home/hhe07/Documents/openrisc/litex/pythondata-cpu-mor1kx/pythondata_cpu_mor1kx/verilog/rtl/verilog/mor1kx_cpu.v:205:37: Expecting expression to be constant, but can't determine constant for FUNCREF 'calc_rf_addr_width'
                                                                                                                                : ... note: In instance 'sim.mor1kx.mor1kx_cpu'
        /home/hhe07/Documents/openrisc/litex/pythondata-cpu-mor1kx/pythondata_cpu_mor1kx/verilog/rtl/verilog/mor1kx_utils.vh:96:18: ... Location of non-constant FUNC 'calc_rf_addr_width': Constant function called under generate
        /home/hhe07/Documents/openrisc/litex/pythondata-cpu-mor1kx/pythondata_cpu_mor1kx/verilog/rtl/verilog/mor1kx_cpu.v:205:37: ... Called from 'calc_rf_addr_width()' with parameters:
           rf_addr_width = ?32?h5
           rf_num_shadow_gpr = ?32?h0
  205 |          localparam RF_ADDR_WIDTH = calc_rf_addr_width(OPTION_RF_ADDR_WIDTH,
      |                                     ^~~~~~~~~~~~~~~~~~
%Error: Exiting due to 2 error(s)

[stffrdhrn]

In the git commit message can you add the verilator error you are fixing?

[hhe07]

done