Use %ptR instead of open coded variant to print content of
struct rtc_time in human readable format.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>