perf build: Rename display_vf to feature_verbose

Preparing for feature checks separation, moving related
stuff under 'feature*' namespace.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <david.ahern@oracle.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-ciaflab01mf0ljmfb9xr4p41@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/config/Makefile

@@ -816,7 +816,7 @@ $(foreach feat,$(FEATURE_DISPLAY),$(call feature_check,$(feat)))
 
 ifeq ($(VF),1)
   feature_display := 1
-  display_vf := 1
+  feature_verbose := 1
 endif
 
 ifeq ($(feature_display),1)
@@ -829,7 +829,7 @@ ifeq ($(feature_display),1)
   endif
 endif
 
-ifeq ($(display_vf),1)
+ifeq ($(feature_verbose),1)
   TMP := $(filter-out $(FEATURE_DISPLAY),$(FEATURE_TESTS))
   $(foreach feat,$(TMP),$(call feature_print_status,$(feat),))
   $(info )