all archs: consolidate init and exit sections in vmlinux.lds.h

This patch consolidate all definitions of .init.text, .init.data
and .exit.text, .exit.data section definitions in
the generic vmlinux.lds.h.

This is a preparational patch - alone it does not buy
us much good.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

arch/ppc/kernel/vmlinux.lds.S

@@ -97,14 +97,14 @@ SECTIONS
   __init_begin = .;
   .init.text : {
 	_sinittext = .;
-	*(.init.text)
+	INIT_TEXT
 	_einittext = .;
   }
   /* .exit.text is discarded at runtime, not link time,
      to deal with references from __bug_table */
-  .exit.text : { *(.exit.text) }
+  .exit.text : { EXIT_TEXT }
   .init.data : {
-    *(.init.data);
+    INIT_DATA
     __vtop_table_begin = .;
     *(.vtop_fixup);
     __vtop_table_end = .;
@@ -164,6 +164,6 @@ SECTIONS
   /* Sections to be discarded. */
   /DISCARD/ : {
     *(.exitcall.exit)
-    *(.exit.data)
+    EXIT_DATA
   }
 }