s390/dasd: Change unsigned long long to unsigned long

Unsigned long long and unsigned long were different in size for 31-bit.
For 64-bit the size for both datatypes is 8 Bytes and since the support
for 31-bit is long gone we can clean up a little and change everything
to unsigned long.
Change get_phys_clock() along the way to accept unsigned long as well so
that the DASD code can be consistent.

Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/time.c

@@ -357,7 +357,7 @@ static unsigned long clock_sync_flags;
  * source. If the clock mode is local it will return -EOPNOTSUPP and
  * -EAGAIN if the clock is not in sync with the external reference.
  */
-int get_phys_clock(unsigned long long *clock)
+int get_phys_clock(unsigned long *clock)
 {
 	atomic_t *sw_ptr;
 	unsigned int sw0, sw1;