softmmu: Build target-agnostic objects once

Various softmmu objects aren't target specific. Move them
to the generic softmmu source set.

For our 31 softmmu targets, this is in total 330 objects
less to build!

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220207075426.81934-22-f4bug@amsat.org>

softmmu/meson.build

 specific_ss.add(when: 'CONFIG_SOFTMMU', if_true: [files(
   'arch_init.c',
-  'balloon.c',
-  'cpus.c',
-  'cpu-throttle.c',
-  'datadir.c',
-  'globals.c',
-  'physmem.c',
   'ioport.c',
-  'rtc.c',
-  'runstate.c',
   'memory.c',
-  'memory_mapping.c',
+  'physmem.c',
   'qtest.c',
-  'vl.c',
-  'cpu-timers.c',
-  'runstate-action.c',
 )])
 
 specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: [files(
@@ -22,9 +11,20 @@ specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: [files(
 )])
 
 softmmu_ss.add(files(
+  'balloon.c',
   'bootdevice.c',
+  'cpus.c',
+  'cpu-throttle.c',
+  'cpu-timers.c',
+  'datadir.c',
   'dma-helpers.c',
+  'globals.c',
+  'memory_mapping.c',
   'qdev-monitor.c',
+  'rtc.c',
+  'runstate-action.c',
+  'runstate.c',
+  'vl.c',
 ), sdl, libpmem, libdaxctl)
 
 if have_tpm