meson.build: Re-enable KVM support for MIPS

After converting from configure to meson, KVM support is lost for MIPS,
so re-enable it in meson.build.

Fixes: fdb75aeff7c212e1afaaa3a43 ("configure: remove target configuration")
Fixes: 8a19980e3fc42239aae054bc9 ("configure: move accelerator logic to meson")
Cc: aolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Message-Id: <1602059975-10115-3-git-send-email-chenhc@lemote.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson.build b/meson.build
index 2623061..0c676af 100644
--- a/meson.build
+++ b/meson.build
@@ -59,6 +59,8 @@
   kvm_targets = ['s390x-softmmu']
 elif cpu in ['ppc', 'ppc64']
   kvm_targets = ['ppc-softmmu', 'ppc64-softmmu']
+elif cpu in ['mips', 'mips64']
+  kvm_targets = ['mips-softmmu', 'mipsel-softmmu', 'mips64-softmmu', 'mips64el-softmmu']
 else
   kvm_targets = []
 endif