rockchip/rk3399: Select VBOOT_MIGRATE_WORKING_DATA

Trusted Firmware places some components in SRAM on RK3399 and therefore
restricts accesses to SRAM to the secure world. This makes the vboot
working data inaccessible to normal world payloads, so we need to
migrate it into CBMEM.

Change-Id: Ic7c95790f2f118ccbdd897550f13b5f987bdd831
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32490
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Joel Kitching <kitching@google.com>

src/soc/rockchip/rk3399/Kconfig

@@ -17,6 +17,7 @@ config SOC_ROCKCHIP_RK3399
 if SOC_ROCKCHIP_RK3399
 
 config VBOOT
+	select VBOOT_MIGRATE_WORKING_DATA
 	select VBOOT_SEPARATE_VERSTAGE
 	select VBOOT_RETURN_FROM_VERSTAGE
 	select VBOOT_OPROM_MATTERS