soc/intel/cpu: Only show MP PPI option when meaningful

Older FSP releases don't have an option to do MP init via PPI, so it
should not be visible.

Change-Id: I74b4bd5dd72980b859763e89ead7d7f619321e66
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63759
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/common/block/cpu/Kconfig b/src/soc/intel/common/block/cpu/Kconfig
index 316ec40..8c14cb2 100644
--- a/src/soc/intel/common/block/cpu/Kconfig
+++ b/src/soc/intel/common/block/cpu/Kconfig
@@ -119,8 +119,8 @@
 
 config USE_INTEL_FSP_TO_CALL_COREBOOT_PUBLISH_MP_PPI
 	bool "Perform MP Initialization by FSP using coreboot MP PPI service"
-	default y if MP_SERVICES_PPI
-	default n
+	default y
+	depends on MP_SERVICES_PPI
 	help
 	  This option allows FSP to make use of MP services PPI published by
 	  coreboot to perform multiprocessor initialization.