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/axi.c b/test/dm/axi.c
index 0900a9b..1138a46 100644
--- a/test/dm/axi.c
+++ b/test/dm/axi.c
@@ -22,7 +22,7 @@
 	return 0;
 }
 
-DM_TEST(dm_test_axi_base, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_axi_base, UTF_SCAN_PDATA | UTF_SCAN_FDT);
 
 /* Test that sandbox PCI bus numbering works correctly */
 static int dm_test_axi_busnum(struct unit_test_state *uts)
@@ -34,7 +34,7 @@
 	return 0;
 }
 
-DM_TEST(dm_test_axi_busnum, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_axi_busnum, UTF_SCAN_PDATA | UTF_SCAN_FDT);
 
 /* Test that we can use the store device correctly */
 static int dm_test_axi_store(struct unit_test_state *uts)
@@ -75,4 +75,4 @@
 	return 0;
 }
 
-DM_TEST(dm_test_axi_store, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_axi_store, UTF_SCAN_PDATA | UTF_SCAN_FDT);