rtc: ds1307: fix ds1339 wakealarm support

rtc: ds1307: fix ds1339 wakealarm support

commit 7dceef78f310f5351735060d78a1777c69606016 upstream.

Commit 51ed73eb998a1c79a2b0e9bed68f75a8a2c93b9b ("rtc: ds1340: Add support
for trickle charger.") breaks ds1339 wakealarm support by limiting
accessible registers. Fix this.

Fixes: 51ed73eb998a ("rtc: ds1340: Add support for trickle charger.")
Cc: stable@vger.kernel.org
Signed-off-by: Soeren Moch <smoch@web.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>