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/cmd/font.c b/test/cmd/font.c
index a8905ce..3ea262b 100644
--- a/test/cmd/font.c
+++ b/test/cmd/font.c
@@ -69,8 +69,8 @@
 
 	return 0;
 }
-FONT_TEST(font_test_base, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT |
-	  UT_TESTF_CONSOLE_REC | UT_TESTF_DM);
+FONT_TEST(font_test_base, UTF_SCAN_PDATA | UTF_SCAN_FDT | UTF_CONSOLE_REC |
+	  UTF_DM);
 
 int do_ut_font(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {