Fix Sparc64 VGA memory size bug exposed by r6604

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6618 c046a42c-6fe2-441c-8c8c-71466251a162

hw/pc.h

@@ -127,7 +127,7 @@ enum vga_retrace_method {
 
 extern enum vga_retrace_method vga_retrace_method;
 
-#ifndef TARGET_SPARC
+#if !defined(TARGET_SPARC) || defined(TARGET_SPARC64)
 #define VGA_RAM_SIZE (8192 * 1024)
 #else
 #define VGA_RAM_SIZE (9 * 1024 * 1024)