Fix FRV minimum slab/kmalloc alignment

> +#define	ARCH_KMALLOC_MINALIGN		(sizeof(long) * 2)
> +#define	ARCH_SLAB_MINALIGN		(sizeof(long) * 2)

This doesn't work if SLAB is selected and slab debugging is enabled as
these are passed to the preprocessor, and the preprocessor doesn't
understand sizeof.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/asm-frv/mem-layout.h

@@ -35,8 +35,8 @@
  * the slab must be aligned such that load- and store-double instructions don't
  * fault if used
  */
-#define	ARCH_KMALLOC_MINALIGN		(sizeof(long) * 2)
-#define	ARCH_SLAB_MINALIGN		(sizeof(long) * 2)
+#define	ARCH_KMALLOC_MINALIGN		8
+#define	ARCH_SLAB_MINALIGN		8
 
 /*****************************************************************************/
 /*