lenovo/x200: Increase default CBFS_SIZE to 2 MiB

The original firmware has a 2 MiB BIOS region in both 4 MiB and 8 MiB
flash variants.  Let's allow using the whole region instead of the
gm45 default of 1 MiB.

Change-Id: I2d8a04bcb992bf2e8e15890a5c6719810b1cf405
Signed-off-by: Michał Masłowski <mtjm@mtjm.eu>
Reviewed-on: http://review.coreboot.org/8392
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/src/mainboard/lenovo/x200/Kconfig b/src/mainboard/lenovo/x200/Kconfig
index 67fc388..01556b3 100644
--- a/src/mainboard/lenovo/x200/Kconfig
+++ b/src/mainboard/lenovo/x200/Kconfig
@@ -42,4 +42,8 @@
 	int
 	default 2
 
+config CBFS_SIZE
+	hex
+	default 0x200000
+
 endif # BOARD_LENOVO_X200