dm: core: Drop header files from dm/test.h

These header file should not be included in other header files. Remove
them and add to each individual file. Add test/test.h to test/ui.h since
that is a reasonable place.

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

test/dm/test-driver.c

@@ -11,9 +11,10 @@
 #include <errno.h>
 #include <log.h>
 #include <malloc.h>
-#include <dm/test.h>
-#include <test/ut.h>
 #include <asm/io.h>
+#include <dm/test.h>
+#include <test/test.h>
+#include <test/ut.h>
 
 int dm_testdrv_op_count[DM_TEST_OP_COUNT];
 static struct unit_test_state *uts = &global_dm_test_state;