AGESA_LEGACY: Apply final cleanup and file removals

With no boards left using AGESA_LEGACY, wipe out remains
of that everywhere in the tree.

Change-Id: I0ddc1f400e56e42fe8a43b4766195e3a187dcea6
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/18633
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/drivers/amd/agesa/Makefile.inc

@@ -13,7 +13,7 @@
 
 ifeq ($(CONFIG_DRIVERS_AMD_PI),y)
 
-ifneq ($(CONFIG_AGESA_LEGACY_WRAPPER)$(CONFIG_BINARYPI_LEGACY_WRAPPER),y)
+ifneq ($(CONFIG_BINARYPI_LEGACY_WRAPPER),y)
 
 romstage-y += romstage.c
 romstage-y += mtrr_fixme.c