target/ppc: Restrict KVM objects to system emulation

CONFIG_KVM is always FALSE on user emulation, so 'kvm.c'
won't be added to ppc_ss[] source set; direcly use the system
specific ppc_system_ss[] source set.

Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20231003070427.69621-4-philmd@linaro.org>

target/ppc/meson.build

@@ -30,7 +30,6 @@ gen = [
 ]
 ppc_ss.add(when: 'CONFIG_TCG', if_true: gen)
 
-ppc_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c'))
 ppc_ss.add(when: 'CONFIG_USER_ONLY', if_true: files('user_only_helper.c'))
 
 ppc_system_ss = ss.source_set()
@@ -46,6 +45,7 @@ ppc_system_ss.add(when: 'CONFIG_TCG', if_true: files(
 ), if_false: files(
   'tcg-stub.c',
 ))
+ppc_system_ss.add(when: 'CONFIG_KVM', if_true: files('kvm.c'))
 
 ppc_system_ss.add(when: 'TARGET_PPC64', if_true: files(
   'compat.c',