powerpc/mpc85xx: add comma before "already enabled"

Now outputs like this:

L2:    512 KB already enabled, moving to 0xf8f80000

rather than this:

L2:    512 KB already enabledmoving to 0xf8f80000

Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Andy Fleming <afleming@gmail.com>