watchdog: rzv2h_wdt: Add missing MODULE_LICENSE tag to fix modpost error

Add the missing `MODULE_LICENSE()` tag to the `rzv2h_wdt` driver, which
resolves the following modpost error when built as a module:

    ERROR: modpost: missing MODULE_LICENSE() in drivers/watchdog/rzv2h_wdt.o

Fixes: f6febd0 ("watchdog: Add Watchdog Timer driver for RZ/V2H(P)")
Reported-by: Stephen Rothwell <[email protected]>
Signed-off-by: Lad Prabhakar <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: prabhakarlad

drivers/watchdog/rzv2h_wdt.c

@@ -270,3 +270,4 @@ static struct platform_driver rzv2h_wdt_driver = {
 module_platform_driver(rzv2h_wdt_driver);
 MODULE_AUTHOR("Lad Prabhakar <[email protected]>");
 MODULE_DESCRIPTION("Renesas RZ/V2H(P) WDT Watchdog Driver");
+MODULE_LICENSE("GPL");