drivers/ocp/dmi/Kconfig: Set FRU_DEVICE_ID depend on OCP_DMI

This will remove "CONFIG_FRU_DEVICE_ID=0" from ".config" when unused.

Change-Id: Ic50de165c1f3de3886d3cd1ae66853c9fad35ed2
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49571
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/drivers/ocp/dmi/Kconfig

@@ -10,3 +10,4 @@ config OCP_DMI
 config FRU_DEVICE_ID
 	int
 	default 0
+	depends on OCP_DMI