move fromhost/tohost for moonlight into ram

env/moonlight/spi_flash.lds

@@ -171,10 +171,10 @@ SECTIONS
   .stack ORIGIN(ram) + LENGTH(ram) - __stack_size :
   {
     PROVIDE( _heap_end = . );
+	PROVIDE( tohost = . );
+  	PROVIDE( fromhost = . );
     . = __stack_size;
     PROVIDE( _sp = . );
   } >ram AT>ram :ram
 
-  PROVIDE( tohost = 0xfffffff0 );
-  PROVIDE( fromhost = 0xfffffff8 );
 }