ppc64: fixing comment

Fixing comment leading to think that 32bit tasks are supported, which is
not the case.

For the record, ppc64le is not supporting 32bit task, while ppc64 (the Big
Endian architecture) has an option to support 32bit task but CRIU doesn't
yet run on ppc64.
Reported-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/ppc64/include/asm/types.h

@@ -100,7 +100,7 @@ typedef uint64_t tls_t;
 /*
  * Copied for the Linux kernel arch/powerpc/include/asm/processor.h
  *
- * NOTE: 32bit task are supported.
+ * NOTE: 32bit tasks are not supported.
  */
 #define TASK_SIZE_USER64 (0x0000400000000000UL)
 #define TASK_SIZE TASK_SIZE_USER64