select frequency from included header

Author: sagark

hdk/cl/developer_designs/cl_firesim/design/cl_firesim.sv

@@ -23,6 +23,7 @@ module cl_firesim
 `include "cl_common_defines.vh"      // CL Defines for all examples
 `include "cl_id_defines.vh"          // Defines for ID0 and ID1 (PCI ID's)
 `include "cl_firesim_defines.vh" // CL Defines for cl_firesim
+`include "cl_firesim_generated_defines.vh" // CL Defines for cl_firesim generated by firesim Makefrag
 
 logic rst_main_n_sync;
 logic rst_firesim_n_sync;
@@ -116,7 +117,7 @@ logic clock_gend_85;  // see above, really ~87
 logic clock_gend_75;
 
 logic firesim_internal_clock;
-assign firesim_internal_clock = clock_gend_90;
+assign firesim_internal_clock = clock_gend_`SELECTED_FIRESIM_CLOCK;
 
 clk_wiz_0_firesim firesim_clocking
 (