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/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 8d4e248..2b7a8f5 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -158,7 +158,7 @@
 		/*
 		 * and the usual data section
 		 */
-		*(.data)
+		DATA_DATA
 		CONSTRUCTORS
 
 		_edata = .;