target-or32: Add target stubs and QOM cpu

Add OpenRISC target stubs, QOM cpu and basic machine.

Signed-off-by: Jia Liu <proljc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/arch_init.h b/arch_init.h
index c7cb94a..3dfea3b 100644
--- a/arch_init.h
+++ b/arch_init.h
@@ -16,6 +16,7 @@
     QEMU_ARCH_SH4 = 1024,
     QEMU_ARCH_SPARC = 2048,
     QEMU_ARCH_XTENSA = 4096,
+    QEMU_ARCH_OPENRISC = 8192,
 };
 
 extern const uint32_t arch_type;