hexagon: Make THREAD_SIZE available to vmlinux.lds

Make THREAD_SIZE available to vmlinux.lds on hexagon by including
asm/thread_info.h the linker script.

This allows init_stack to be allocated in the linker script in a subsequent
patch.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Richard Kuo <rkuo@codeaurora.org>
cc: linux-hexagon@vger.kernel.org

arch/hexagon/kernel/vmlinux.lds.S

@@ -22,6 +22,8 @@
 #include <asm/asm-offsets.h>	/*  Most of the kernel defines are here  */
 #include <asm/mem-layout.h>	/*  except for page_offset  */
 #include <asm/cache.h>		/*  and now we're pulling cache line size  */
+#include <asm/thread_info.h>	/*  and we need THREAD_SIZE too */
+
 OUTPUT_ARCH(hexagon)
 ENTRY(stext)