Move net.h to include/net/

+ Move net-android.c and net.c to net/
+ Rename net-checksum.c to net/checksum.c
+ Move sockets.h and shaper.h to include/android/
  and sockets.c + shaper.c to android/

+ Move vgafont.h to ui/

Change-Id: I2659a919a316d3f95aac0f9924833eeee4cb5592
diff --git a/os-posix.c b/os-posix.c
index 324bf13..483aa5e 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -36,7 +36,7 @@
 /* Needed early for CONFIG_BSD etc. */
 #include "config-host.h"
 #include "sysemu.h"
-#include "net.h"
+#include "net/net.h"
 #include "qemu-options.h"
 
 #ifdef CONFIG_LINUX