ec/lenovo/h8/Kconfig: increase ps2 kbd timeout from 3000 to 5000ms

On my Thinkpad T420 the default 3000ms SeaBIOS timeout is too short,
it takes nearly 5000ms for my keyboard to become ready.

Timing out before it's ready leads to pretty bad behavior: I cannot use
my keyboard at all to control SeaBIOS, nor the subsequent GRUB instance.
Linux is fine though, possibly because it does its own keyboard init.

Signed-off-by: Michael Bacarella <michael.bacarella@gmail.com>
Change-Id: Id1681bf3921c8b5dc124d4c4e9072f146f84f3a2
Reviewed-on: https://review.coreboot.org/c/31279
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/ec/lenovo/h8/Kconfig b/src/ec/lenovo/h8/Kconfig
index f9b0b14..9df60de 100644
--- a/src/ec/lenovo/h8/Kconfig
+++ b/src/ec/lenovo/h8/Kconfig
@@ -7,7 +7,7 @@
 config SEABIOS_PS2_TIMEOUT
 	int
 	depends on PAYLOAD_SEABIOS
-	default 3000
+	default 5000
 
 config H8_BEEP_ON_DEATH
 	bool "Beep on fatal error"