Lenovo X60/T60: add first_battery setting

The EC allows to select the order in which batteries are (dis)charged.
Make this setting available to the user.

Change-Id: Id2a98192565419dbb53f3a7cf0b2c46b672a3ed8
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/475
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Peter Stuge <peter@stuge.se>

src/mainboard/lenovo/x60/cmos.layout

@@ -109,6 +109,7 @@ entries
 
 1064         8       h       0        volume
 1072         8       h       0        tft_brightness
+1080         1       e       9        first_battery
 # -----------------------------------------------------------------
 
 enumerations
@@ -142,6 +143,8 @@ enumerations
 7     2     Keep
 8     0     No
 8     1     Yes
+9     0	    Secondary
+9     1	    Primary
 
 # -----------------------------------------------------------------
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