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/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index f266209..f7d7bf1 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -168,7 +168,7 @@
 #ifdef CONFIG_PPC32
 	.data    :
 	{
-		*(.data)
+		DATA_DATA
 		*(.sdata)
 		*(.got.plt) *(.got)
 	}