ec/lenovo/h8: Enable 3G modem

Just like bluetooth and wlan it need to be enabled in EC.
Set the appropriate bit in EC if CMOS config says so.

Change-Id: Ia48ca3201f013d3b4c4153f32ff536e06b6a2f6d
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4516
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/mainboard/lenovo/x60/cmos.layout

@@ -111,6 +111,7 @@ entries
 1072         8       h       0        tft_brightness
 1080         1       e       9        first_battery
 1081         1       e       1        bluetooth
+1082         1       e       1        wwan
 # -----------------------------------------------------------------
 
 enumerations