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/um/kernel/uml.lds.S b/arch/um/kernel/uml.lds.S
index 8435105..307b937 100644
--- a/arch/um/kernel/uml.lds.S
+++ b/arch/um/kernel/uml.lds.S
@@ -61,7 +61,7 @@
     *(.data.init_task)
     . = ALIGN(KERNEL_STACK_SIZE);
     *(.data.init_irqstack)
-    *(.data)
+    DATA_DATA
     *(.gnu.linkonce.d*)
     CONSTRUCTORS
   }