purism/librem13v2: Add Kconfig defaults

Add default values for MAINBOARD_VERSION and CBFS_SIZE.

Change-Id: Ib6461cef78f3fea448baf1ada456e3c8335f1543
Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm>
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/19942
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Youness Alaoui <snifikino@gmail.com>
diff --git a/src/mainboard/purism/librem13v2/Kconfig b/src/mainboard/purism/librem13v2/Kconfig
index dc423a9..9a1f3bb 100644
--- a/src/mainboard/purism/librem13v2/Kconfig
+++ b/src/mainboard/purism/librem13v2/Kconfig
@@ -28,6 +28,10 @@
 	string
 	default "Librem 13 v2"
 
+config MAINBOARD_VERSION
+	string
+	default "2.0"
+
 config MAINBOARD_DIR
 	string
 	default "purism/librem13v2"
@@ -62,4 +66,8 @@
 	hex
 	default 0xFFE115A0
 
+config CBFS_SIZE
+	hex
+	default 0x5c0000
+
 endif