rtc: pcf8563: Fix the datasheet URL

The current datasheet URL is no longer valid.

Replace with a valid one.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210603143447.2223353-3-festevam@gmail.com

drivers/rtc/rtc-pcf8563.c

@@ -8,7 +8,7 @@
  *
  * based on the other drivers in this same directory.
  *
- * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf
+ * https://www.nxp.com/docs/en/data-sheet/PCF8563.pdf
  */
 
 #include <linux/clk-provider.h>