system: Rename softmmu/ directory as system/

The softmmu/ directory contains files specific to system
emulation. Rename it as system/. Update meson rules, the
MAINTAINERS file and all the documentation and comments.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20231004090629.37473-14-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson.build b/meson.build
index 167cb70..79aef19 100644
--- a/meson.build
+++ b/meson.build
@@ -3291,7 +3291,7 @@
     'hw/gpio',
     'migration',
     'net',
-    'softmmu',
+    'system',
     'ui',
     'hw/remote',
   ]
@@ -3418,7 +3418,7 @@
 common_ss.add(files('cpu-common.c'))
 specific_ss.add(files('cpu-target.c'))
 
-subdir('softmmu')
+subdir('system')
 
 # Work around a gcc bug/misfeature wherein constant propagation looks
 # through an alias:
@@ -3797,14 +3797,14 @@
     execs = [{
       'name': 'qemu-system-' + target_name,
       'win_subsystem': 'console',
-      'sources': files('softmmu/main.c'),
+      'sources': files('system/main.c'),
       'dependencies': []
     }]
     if targetos == 'windows' and (sdl.found() or gtk.found())
       execs += [{
         'name': 'qemu-system-' + target_name + 'w',
         'win_subsystem': 'windows',
-        'sources': files('softmmu/main.c'),
+        'sources': files('system/main.c'),
         'dependencies': []
       }]
     endif