intel/nehalem: Add get_top_top_ram() in ramstage

Needed to resolve CBMEM location early in ramstage. With DYNAMIC_CBMEM
set_top_of_ram() will no longer be available.

Change-Id: If50f1c5455a587b096348ffedadbe1dd2350a714
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/6030
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com>

src/northbridge/intel/nehalem/raminit.c

@@ -4979,12 +4979,3 @@ void raminit(const int s3resume, const u8 *spd_addrmap)
 		save_timings(&info);
 #endif
 }
-
-#if REAL
-unsigned long get_top_of_ram(void)
-{
-	/* Base of TSEG is top of usable DRAM */
-	u32 tom = pci_read_config32(PCI_DEV(0, 0, 0), TSEG);
-	return (unsigned long)tom;
-}
-#endif