x60,t60: do not add etc/ps2-keyboard-spinup for non-seabios payloads

Regardless of the payload chosen a file etc/ps2-keyboard-spinup
is added to cbfs. With this fix this file is only added to cbfs when
seabios is choses as a payload.

Change-Id: I37cf4c998856db2d297356776752643dba46a8f8
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/16146
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>

src/mainboard/lenovo/t60/Kconfig

@@ -52,6 +52,7 @@ config MAX_CPUS
 
 config SEABIOS_PS2_TIMEOUT
 	int
+	depends on PAYLOAD_SEABIOS
 	default 3000
 
 endif

src/mainboard/lenovo/x60/Kconfig

@@ -59,6 +59,7 @@ config MAX_CPUS
 
 config SEABIOS_PS2_TIMEOUT
 	int
+	depends on PAYLOAD_SEABIOS
 	default 3000
 
 endif