sh: fix compressed kernel build

commit 54a01510 broke zImage build on sh arch:

 LD      vmlinux
  SYSMAP  System.map
  SYSMAP  .tmp_System.map
  AS      arch/sh/boot/compressed/head_32.o
In file included from /k/arch/sh/boot/compressed/head_32.S:11:
/k/include/linux/linkage.h:34: error: syntax error in macro parameter list

Fix it for both sh and sh64.
Signed-off-by: NManuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/boot/compressed/head_32.S

@@ -7,7 +7,6 @@
 
 .text
 
-#include <linux/linkage.h>
 #include <asm/page.h>
 
 	.global	startup

arch/sh/boot/compressed/head_64.S

@@ -13,7 +13,6 @@
  * Modification for compressed loader:
  *   Copyright (C) 2002 Stuart Menefy (stuart.menefy@st.com)
  */
-#include <linux/linkage.h>
 #include <asm/cache.h>
 #include <asm/cpu/mmu_context.h>
 #include <asm/cpu/registers.h>