tools: always enable HAS_MEM_ACCESS

For all supported targets HAS_MEM_ACCESS is enabled so this drops the
conditional and always makes it enabled. The goal here is to remove the
setting in the top level config directory when kconfig changes land.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/tests/xen-access/Makefile

@@ -7,8 +7,7 @@ CFLAGS += $(CFLAGS_libxenctrl)
 CFLAGS += $(CFLAGS_libxenguest)
 CFLAGS += $(CFLAGS_xeninclude)
 
-TARGETS-y :=
-TARGETS-$(HAS_MEM_ACCESS) := xen-access
+TARGETS-y := xen-access
 TARGETS := $(TARGETS-y)
 
 .PHONY: all