all-archs: consolidate .data section definition in asm-generic

With this consolidation we can now modify the .data
section definition in one spot for all archs.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/arch/ppc/kernel/vmlinux.lds.S b/arch/ppc/kernel/vmlinux.lds.S
index 419ef7e..19db874 100644
--- a/arch/ppc/kernel/vmlinux.lds.S
+++ b/arch/ppc/kernel/vmlinux.lds.S
@@ -67,7 +67,7 @@
   . = ALIGN(4096);
   .data    :
   {
-    *(.data)
+    DATA_DATA
     *(.data1)
     *(.sdata)
     *(.sdata2)