mainboard/lenovo: reserve century byte

The century byte is used by most RTC (default 0x32@nvram).
Even the century byte can disabled via ACPI it's more safe to reserve
it's space. Because some RTC will act with that byte anyhow.
Some OS overwrite it when syncronize the RTC.

Change-Id: I078c0c57215ccb925afa85b9d067f15268801ec9
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: https://review.coreboot.org/11853
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/mainboard/lenovo/x60/cmos.layout b/src/mainboard/lenovo/x60/cmos.layout
index e267bb5..54a2799 100644
--- a/src/mainboard/lenovo/x60/cmos.layout
+++ b/src/mainboard/lenovo/x60/cmos.layout
@@ -52,9 +52,7 @@
 395          4       e       6        debug_level
 #399          1       r       0        unused
 
-# coreboot config options: cpu
-400          1       e       2        hyper_threading
-#401          7       r       0        unused
+#400         8       r       0        reserved for century byte
 
 # coreboot config options: southbridge
 408          1       e       1        nmi
@@ -66,7 +64,11 @@
 928          8       h       0        boot_default
 936          1       e       8        cmos_defaults_loaded
 937          1       e       1        lpt
-#938         46       r       0        unused
+#938         6       r       0        unused
+
+# coreboot config options: cpu
+944          1       e       2        hyper_threading
+#945         7       r       0        unused
 
 # coreboot config options: check sums
 984         16       h       0        check_sum