Set applehv as default darwin provider

Podman 5 will not support QEMU on darwin anymore.  This PR only changes the default from `qemu` to `applehv`.  Code changes to enforce not supporting qemu will come later.

[NO NEW TESTS NEEDED]

Signed-off-by: Brent Baude <baude@redhat.com>

pkg/machine/provider/platform_darwin.go

@@ -20,7 +20,7 @@ func Get() (machine.VirtProvider, error) {
 	if providerOverride, found := os.LookupEnv("CONTAINERS_MACHINE_PROVIDER"); found {
 		provider = providerOverride
 	}
-	resolvedVMType, err := machine.ParseVMType(provider, machine.QemuVirt)
+	resolvedVMType, err := machine.ParseVMType(provider, machine.AppleHvVirt)
 	if err != nil {
 		return nil, err
 	}