[ARM] Shut up warning about init_thread_union

Fix false warning:

WARNING: arch/arm/kernel/init_task.o - Section mismatch:
 reference to .init.task:init_thread_union from .data between
 'init_task' (at offset 0x4) and 'init_sighand'

caused by the section name starting with ".init".
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/init_task.c

@@ -31,7 +31,7 @@ EXPORT_SYMBOL(init_mm);
  * The things we do for performance..
  */
 union thread_union init_thread_union
-	__attribute__((__section__(".init.task"))) =
+	__attribute__((__section__(".data.init_task"))) =
 		{ INIT_THREAD_INFO(init_task) };
 
 /*

arch/arm/kernel/vmlinux.lds.S

@@ -119,7 +119,7 @@ SECTIONS
 		 * first, the init task union, aligned
 		 * to an 8192 byte boundary.
 		 */
-		*(.init.task)
+		*(.data.init_task)
 
 #ifdef CONFIG_XIP_KERNEL
 		. = ALIGN(4096);