test: Rename unit-test flags

The UT_TESTF_ macros read as 'unit test test flags' which is not right.
Rename to UTF ('unit test flags').

This has the benefit of being shorter, which helps keep UNIT_TEST()
declarations on a single line.

Give the enum a name and reference it from the UNIT_TEST() macros while
we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/reset.c b/test/dm/reset.c
index d3158bf..99f46fe 100644
--- a/test/dm/reset.c
+++ b/test/dm/reset.c
@@ -67,7 +67,7 @@
 	return 0;
 }
 
-DM_TEST(dm_test_reset_base, UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_reset_base, UTF_SCAN_FDT);
 
 static int dm_test_reset(struct unit_test_state *uts)
 {
@@ -94,7 +94,7 @@
 
 	return 0;
 }
-DM_TEST(dm_test_reset, UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_reset, UTF_SCAN_FDT);
 
 static int dm_test_reset_devm(struct unit_test_state *uts)
 {
@@ -119,7 +119,7 @@
 
 	return 0;
 }
-DM_TEST(dm_test_reset_devm, UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_reset_devm, UTF_SCAN_FDT);
 
 static int dm_test_reset_bulk(struct unit_test_state *uts)
 {
@@ -149,7 +149,7 @@
 
 	return 0;
 }
-DM_TEST(dm_test_reset_bulk, UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_reset_bulk, UTF_SCAN_FDT);
 
 static int dm_test_reset_bulk_devm(struct unit_test_state *uts)
 {
@@ -181,4 +181,4 @@
 
 	return 0;
 }
-DM_TEST(dm_test_reset_bulk_devm, UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_reset_bulk_devm, UTF_SCAN_FDT);