via/vx900: Remove leftover code

Code is not used with EARLY_CBMEM_INIT and it
appears to have been invalid register anyways.

Change-Id: If0662937b38aec71292113ce8abd88da0b73feee
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26347
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Martin Roth <martinroth@google.com>

src/northbridge/via/vx900/early_vx900.c

@@ -18,12 +18,6 @@
 #include <arch/io.h>
 #include <console/console.h>
 
-uintptr_t restore_top_of_low_cacheable(void)
-{
-	u8 reg_tom = pci_read_config8(MCU, 0x88);
-	return (reg_tom << 24) - 256 * MiB;
-}
-
 /**
  * \brief Enable accessing of PCI configuration space for all devices.
  *