vc/eltan/security/mboot/Kconfig: Add dependency of VBOOT

VENDORCODE_ELTAN_MBOOT should not be used when VBOOT is enabled.

Hide VENDOCODE_ELTAN_MBOOT when VBOOT is enabled.

BUG = N/A
TEST = run `make menuconfig` and boot Facebook FBG1701

Change-Id: Iac57103431cc7efac5b6019f180572d255e683ab
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52021
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Wim Vervoorn <wvervoorn@eltan.com>
diff --git a/src/vendorcode/eltan/security/mboot/Kconfig b/src/vendorcode/eltan/security/mboot/Kconfig
index 540b7b2..4e30cf5 100644
--- a/src/vendorcode/eltan/security/mboot/Kconfig
+++ b/src/vendorcode/eltan/security/mboot/Kconfig
@@ -4,6 +4,7 @@
 
 config VENDORCODE_ELTAN_MBOOT
 	bool "Measure firmware with mboot."
+	depends on !VBOOT
 	default n
 	select VBOOT_LIB
 	help