m68k: replace gcc specific macros with ones from compiler.h

There is <linux/compiler.h> which provides macros for various gcc
specific constructs.  Eg: __weak for __attribute__((weak)).  I've
cleaned all instances of gcc specific attributes with the right macros
for all files under /arch/m68k

Link: http://lkml.kernel.org/r/1485540901-1988-3-git-send-email-gidisrael@gmail.com
Signed-off-by: Gideon Israel Dsouza <gidisrael@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/m68k/include/asm/MC68EZ328.h b/arch/m68k/include/asm/MC68EZ328.h
index fedac87..703331e 100644
--- a/arch/m68k/include/asm/MC68EZ328.h
+++ b/arch/m68k/include/asm/MC68EZ328.h
@@ -9,6 +9,7 @@
  *                     The Silver Hammer Group, Ltd.
  *
  */
+#include <linux/compiler.h>
 
 #ifndef _MC68EZ328_H_
 #define _MC68EZ328_H_
@@ -815,7 +816,7 @@ typedef volatile struct {
   volatile unsigned short int nipr;
   volatile unsigned short int pad1;
   volatile unsigned short int pad2;
-} __attribute__((packed)) m68328_uart;
+} __packed m68328_uart;
 
 
 /**********