nios2: fix .text/.data interaction with .previous

Just like obj_elf_section() is called for .section, obj_elf_{text,data}()
need calling for .text/.data.
diff --git a/gas/config/tc-nios2.c b/gas/config/tc-nios2.c
index 999890e..364b6df 100644
--- a/gas/config/tc-nios2.c
+++ b/gas/config/tc-nios2.c
@@ -507,7 +507,7 @@
 static void
 s_nios2_text (int i)
 {
-  s_text (i);
+  obj_elf_text (i);
   nios2_last_label = NULL;
   nios2_current_align = 0;
   nios2_current_align_seg = now_seg;
@@ -518,7 +518,7 @@
 static void
 s_nios2_data (int i)
 {
-  s_data (i);
+  obj_elf_data (i);
   nios2_last_label = NULL;
   nios2_current_align = 0;
   nios2_current_align_seg = now_seg;