watchdog: xilinx: Setup the origin compatible string

Watchdog 1.01.a is also compatible with 1.00.a.
Add the origin version to compatible list.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>