vc/amd/opensil/stub/mpio: change mpio_engine_type prefix to IFTYPE

Change the prefix of the elements of the mpio_engine_type enum from
ENGINE_ to IFTYPE_.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Suggested-by: Matt DeVillier <matt.devillier@gmail.com>
Change-Id: If81c5ea01ba147b71b423004a2199b348ffac99a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81346
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>

src/vendorcode/amd/opensil/stub/mpio/chip.h

@@ -3,8 +3,8 @@
 #include <types.h>
 
 enum mpio_engine_type {
-	ENGINE_PCIE,
-	ENGINE_SATA,
+	IFTYPE_PCIE,
+	IFTYPE_SATA,
 };
 
 /* Sync with PCIE_HOTPLUG_TYPE */