Select a default SeaBIOS PS2 timeout in H8 Kconfig

This timeout is probably needed on all devices with Lenovo H8 embedded
controllers so set the default there.

Change-Id: I830ab1894f7c0f10f55c82e398becf44d810852d
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/18274
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>

src/ec/lenovo/h8/Kconfig

@@ -2,5 +2,14 @@ config EC_LENOVO_H8
 	select EC_ACPI
 	bool
 
+if EC_LENOVO_H8
+
+config SEABIOS_PS2_TIMEOUT
+	int
+	depends on PAYLOAD_SEABIOS
+	default 3000
+
+endif
+
 config H8_DOCK_EARLY_INIT
 	bool