watchdog: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/watchdog/omap_wdt.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/watchdog/twl4030_wdt.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/watchdog/ts4800_wdt.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/watchdog/simatic-ipc-wdt.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/watchdog/menz69_wdt.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240607-md-drivers-watchdog-v1-1-485c1c58301f@quicinc.com


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>