Remove dirty_enabled from cfg_t

The addition of Svadu support and removal of --mmu-dirty
command line flag results in the dirty_enabled configuration state
no longer being used. Remove the remnants of this state.

ci-tests/testlib.c

@@ -23,7 +23,6 @@ int main()
             "vlen:128,elen:64",
             false,
             endianness_little,
-            false,
             16,
             mem_cfg,
             hartids,

riscv/cfg.h

@@ -67,7 +67,6 @@ public:
         const char *default_varch,
         const bool default_misaligned,
         const endianness_t default_endianness,
-        const bool default_dirty_enabled,
         const reg_t default_pmpregions,
         const std::vector<mem_cfg_t> &default_mem_layout,
         const std::vector<int> default_hartids,
@@ -80,7 +79,6 @@ public:
       varch(default_varch),
       misaligned(default_misaligned),
       endianness(default_endianness),
-      dirty_enabled(default_dirty_enabled),
       pmpregions(default_pmpregions),
       mem_layout(default_mem_layout),
       hartids(default_hartids),
@@ -96,7 +94,6 @@ public:
   cfg_arg_t<const char *>            varch;
   bool                               misaligned;
   endianness_t                       endianness;
-  bool                               dirty_enabled;
   reg_t                              pmpregions;
   cfg_arg_t<std::vector<mem_cfg_t>>  mem_layout;
   std::optional<reg_t>               start_pc;

riscv/mmu.h

@@ -274,8 +274,6 @@ public:
 
   void register_memtracer(memtracer_t*);
 
-  int is_dirty_enabled() { return proc && proc->cfg->dirty_enabled; }
-
   int is_misaligned_enabled()
   {
     return proc && proc->get_cfg().misaligned;

spike_main/spike-log-parser.cc

@@ -35,7 +35,6 @@ int main(int UNUSED argc, char** argv)
             /*default_varch=*/DEFAULT_VARCH,
             /*default_misaligned=*/false,
             /*default_endianness*/endianness_little,
-            /*default_dirty_enabled=*/false,
             /*default_pmpregions=*/16,
             /*default_mem_layout=*/std::vector<mem_cfg_t>(),
             /*default_hartids=*/std::vector<int>(),

spike_main/spike.cc

@@ -351,7 +351,6 @@ int main(int argc, char** argv)
             /*default_varch=*/DEFAULT_VARCH,
             /*default_misaligned=*/false,
             /*default_endianness*/endianness_little,
-            /*default_dirty_enabled*/false,
             /*default_pmpregions=*/16,
             /*default_mem_layout=*/parse_mem_layout("2048"),
             /*default_hartids=*/std::vector<int>(),