spl: Split out bootstage ID into a function

We have two separate places that need to figure out the bootstage ID to
use. Put this code in a function so that the logic is in one place.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/spl/spl.c b/common/spl/spl.c
index 5f51098..556a91a 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -387,6 +387,22 @@
 
 #endif /* HANDOFF */
 
+/**
+ * get_bootstage_id() - Get the bootstage ID to emit
+ *
+ * @start: true if this is for starting SPL, false for ending it
+ * @return bootstage ID to use
+ */
+static enum bootstage_id get_bootstage_id(bool start)
+{
+	enum u_boot_phase phase = spl_phase();
+
+	if (IS_ENABLED(CONFIG_TPL_BUILD) && phase == PHASE_TPL)
+		return start ? BOOTSTAGE_ID_START_TPL : BOOTSTAGE_ID_END_TPL;
+	else
+		return start ? BOOTSTAGE_ID_START_SPL : BOOTSTAGE_ID_END_SPL;
+}
+
 static int spl_common_init(bool setup_malloc)
 {
 	int ret;
@@ -417,8 +433,8 @@
 			      __func__, ret);
 	}
 #endif /* CONFIG_BOOTSTAGE_STASH */
-	bootstage_mark_name(spl_phase() == PHASE_TPL ? BOOTSTAGE_ID_START_TPL :
-			    BOOTSTAGE_ID_START_SPL, SPL_TPL_NAME);
+	bootstage_mark_name(get_bootstage_id(true),
+			    spl_phase_name(spl_phase()));
 #if CONFIG_IS_ENABLED(LOG)
 	ret = log_init();
 	if (ret) {
@@ -733,8 +749,7 @@
 	debug("SPL malloc() used 0x%lx bytes (%ld KB)\n", gd->malloc_ptr,
 	      gd->malloc_ptr / 1024);
 #endif
-	bootstage_mark_name(spl_phase() == PHASE_TPL ? BOOTSTAGE_ID_END_TPL :
-			    BOOTSTAGE_ID_END_SPL, "end " SPL_TPL_NAME);
+	bootstage_mark_name(get_bootstage_id(false), "end phase");
 #ifdef CONFIG_BOOTSTAGE_STASH
 	ret = bootstage_stash((void *)CONFIG_BOOTSTAGE_STASH_ADDR,
 			      CONFIG_BOOTSTAGE_STASH_SIZE);