[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>
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index 6be6729..faf32de 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -119,7 +119,7 @@
 		 * first, the init task union, aligned
 		 * to an 8192 byte boundary.
 		 */
-		*(.init.task)
+		*(.data.init_task)
 
 #ifdef CONFIG_XIP_KERNEL
 		. = ALIGN(4096);