Use brace initializers for debug_module_config_t defaults

riscv/debug_module.h

@@ -14,15 +14,15 @@ class processor_t;
 typedef struct {
   // Size of program_buffer in 32-bit words, as exposed to the rest of the
   // world.
-  unsigned progbufsize;
-  unsigned max_sba_data_width;
-  bool require_authentication;
-  unsigned abstract_rti;
-  bool support_hasel;
-  bool support_abstract_csr_access;
-  bool support_abstract_fpr_access;
-  bool support_haltgroups;
-  bool support_impebreak;
+  unsigned progbufsize = 2;
+  unsigned max_sba_data_width = 0;
+  bool require_authentication = false;
+  unsigned abstract_rti = 0;
+  bool support_hasel = true;
+  bool support_abstract_csr_access = true;
+  bool support_abstract_fpr_access = true;
+  bool support_haltgroups = true;
+  bool support_impebreak = true;
 } debug_module_config_t;
 
 typedef struct {