loongarch: switch boards to "default y"

Some targets use "default y" for boards to filter out those that require
TCG.  For consistency we are switching all other targets to do the same.
Continue with Loongarch.

No changes to generated config-devices.mak file.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/.gitlab-ci.d/buildtest.yml b/.gitlab-ci.d/buildtest.yml
index 75222c4..a82848b 100644
--- a/.gitlab-ci.d/buildtest.yml
+++ b/.gitlab-ci.d/buildtest.yml
@@ -648,8 +648,8 @@
     - make check-tcg
 
 # Check our reduced build configurations
-# requires libfdt: aarch64, arm, i386, x86_64
-# does not build without boards: i386, x86_64
+# requires libfdt: aarch64, arm, i386, loongarch64, x86_64
+# does not build without boards: i386, loongarch64, x86_64
 build-without-defaults:
   extends: .native_build_job_template
   needs:
diff --git a/configs/devices/loongarch64-softmmu/default.mak b/configs/devices/loongarch64-softmmu/default.mak
index 0893112..ffe7058 100644
--- a/configs/devices/loongarch64-softmmu/default.mak
+++ b/configs/devices/loongarch64-softmmu/default.mak
@@ -3,4 +3,5 @@
 # Uncomment the following lines to disable these optional devices:
 # CONFIG_PCI_DEVICES=n
 
-CONFIG_LOONGARCH_VIRT=y
+# Boards are selected by default, uncomment to keep out of the build.
+# CONFIG_LOONGARCH_VIRT=n
diff --git a/hw/loongarch/Kconfig b/hw/loongarch/Kconfig
index 5727efe..7864050 100644
--- a/hw/loongarch/Kconfig
+++ b/hw/loongarch/Kconfig
@@ -1,5 +1,7 @@
 config LOONGARCH_VIRT
     bool
+    default y
+    depends on LOONGARCH64
     select PCI
     select PCI_EXPRESS_GENERIC_BRIDGE
     imply VIRTIO_VGA