lenovo/t60 lenovo/x60: Default SEABIOS_PS2_TIMEOUT to 3 seconds

The ThinkPad keyboard controller sometimes needs a while in order
to initialize, so let's ask SeaBIOS to wait for it.

This change ensures that the internal keyboard always functions
correctly on the ThinkPad when coreboot is built with SeaBIOS as
payload.

Change-Id: I562475ec98b0c1f5d0debf6e9b597748a420f068
Signed-off-by: Peter Stuge <peter@stuge.se>
Reviewed-on: http://review.coreboot.org/3735
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martin.roth@se-eng.com>
diff --git a/src/mainboard/lenovo/x60/Kconfig b/src/mainboard/lenovo/x60/Kconfig
index 1a765fb..72aeef8 100644
--- a/src/mainboard/lenovo/x60/Kconfig
+++ b/src/mainboard/lenovo/x60/Kconfig
@@ -58,4 +58,8 @@
 	string
 	default "LENOVO"
 
+config SEABIOS_PS2_TIMEOUT
+	int
+	default 3000
+
 endif