spl: Rename SPL_TPL_NAME and SPL_TPL_PROMPT

Rename these to use the word PHASE instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/spl_legacy.c b/common/spl/spl_legacy.c
index a778934..9252b3a 100644
--- a/common/spl/spl_legacy.c
+++ b/common/spl/spl_legacy.c
@@ -71,7 +71,7 @@
 
 	spl_image->os = image_get_os(header);
 	spl_image->name = image_get_name(header);
-	debug(SPL_TPL_PROMPT
+	debug(PHASE_PROMPT
 	      "payload image: %32s load addr: 0x%lx size: %d\n",
 	      spl_image->name, spl_image->load_addr, spl_image->size);