Added a reference to the new file "gl/mgmt_defines.v" in the

caravel_pico repository.  The issue is that each SoC implementation
defines its own modules and therefore needs its own includes.  The
implication is that this file now needs to exist in every SoC
implementation's verilog/gl/ directory.

verilog/rtl/caravan_netlists.v

@@ -65,6 +65,7 @@
 	`include "gl/gpio_logic_high.v"
 	`include "gl/xres_buf.v"
 	`include "gl/spare_logic_block.v"
+	`include "gl/mgmt_defines.v"
 	`include "gl/mgmt_core_wrapper.v"
 	`include "gl/caravan.v"
     `else

verilog/rtl/caravel_netlists.v

@@ -63,6 +63,7 @@
 	`include "gl/gpio_logic_high.v"
 	`include "gl/xres_buf.v"
 	`include "gl/spare_logic_block.v"
+	`include "gl/mgmt_defines.v"
 	`include "gl/mgmt_core_wrapper.v"
 	`include "gl/caravel.v"
     `else