test: Drop the UT_TESTF_LIVE_OR_FLAT flag

This was a workaround for a rare situation. Now that it will be more
common and we have a proper fix, drop the flag. We can run both types of
tests in the same sandbox executable, even if the flat device tree is
modified.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/test/test.h

@@ -54,8 +54,6 @@ enum {
 	UT_TESTF_CONSOLE_REC	= BIT(5),	/* needs console recording */
 	/* do extra driver model init and uninit */
 	UT_TESTF_DM		= BIT(6),
-	/* live or flat device tree, but not both in the same executable */
-	UT_TESTF_LIVE_OR_FLAT	= BIT(7),
 };
 
 /**