unicore32-softmmu: Add puv3 soc/board support

This patch only add puv3 soc/board support, which introduces puv3
machine description, and specifies console type.

Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/default-configs/unicore32-softmmu.mak b/default-configs/unicore32-softmmu.mak
index 5f04fe3..726a338 100644
--- a/default-configs/unicore32-softmmu.mak
+++ b/default-configs/unicore32-softmmu.mak
@@ -1 +1,2 @@
 # Default configuration for unicore32-softmmu
+CONFIG_PUV3=y