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>