ioemu-remote: change VGA_RAM_SIZE to 4MB.

Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
diff --git a/hw/pc.h b/hw/pc.h
index a78e039..52f1365 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -116,7 +116,7 @@ int piix4_init(PCIBus *bus, int devfn);
 /* vga.c */
 
 #ifndef TARGET_SPARC
-#define VGA_RAM_SIZE (8192 * 1024)
+#define VGA_RAM_SIZE (4096 * 1024)
 #else
 #define VGA_RAM_SIZE (9 * 1024 * 1024)
 #endif