bootcount: Update to point to current documentation

The current documentation for the bootcount API is on our website and
not the old wiki, update the link in two places.

Signed-off-by: Tom Rini <trini@konsulko.com>

doc/device-tree-bindings/bootcount-syscon.txt

@@ -1,6 +1,6 @@
 Bootcount Configuration
 This is the implementation of the feature as described in
-https://www.denx.de/wiki/DULG/UBootBootCountLimit.
+https://docs.u-boot.org/en/latest/api/bootcount.html
 
 Required Properties:
 - compatible: must be "u-boot,bootcount-syscon".

drivers/bootcount/Kconfig

@@ -6,7 +6,7 @@ menuconfig BOOTCOUNT_LIMIT
 	bool "Enable support for checking boot count limit"
 	help
 	  Enable checking for exceeding the boot count limit.
-	  More information: http://www.denx.de/wiki/DULG/UBootBootCountLimit
+	  More information: https://docs.u-boot.org/en/latest/api/bootcount.html
 
 if BOOTCOUNT_LIMIT