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/virtio_device.c b/test/dm/virtio_device.c
index 63dc534..53414e4 100644
--- a/test/dm/virtio_device.c
+++ b/test/dm/virtio_device.c
@@ -44,7 +44,7 @@
 
 	return 0;
 }
-DM_TEST(dm_test_virtio_base, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_virtio_base, UTF_SCAN_PDATA | UTF_SCAN_FDT);
 
 /* Test all of the virtio uclass ops */
 static int dm_test_virtio_all_ops(struct unit_test_state *uts)
@@ -93,7 +93,7 @@
 
 	return 0;
 }
-DM_TEST(dm_test_virtio_all_ops, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_virtio_all_ops, UTF_SCAN_PDATA | UTF_SCAN_FDT);
 
 /* Test removal of virtio device driver */
 static int dm_test_virtio_remove(struct unit_test_state *uts)
@@ -122,7 +122,7 @@
 
 	return 0;
 }
-DM_TEST(dm_test_virtio_remove, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_virtio_remove, UTF_SCAN_PDATA | UTF_SCAN_FDT);
 
 /* Test all of the virtio ring */
 static int dm_test_virtio_ring(struct unit_test_state *uts)
@@ -194,4 +194,4 @@
 
 	return 0;
 }
-DM_TEST(dm_test_virtio_ring, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+DM_TEST(dm_test_virtio_ring, UTF_SCAN_PDATA | UTF_SCAN_FDT);