watchdog: s3c2410: remove unused freq_to_wdt and s3c2410wdt_is_running functions

clang with W=1 reports
drivers/watchdog/s3c2410_wdt.c:311:35: error: unused function
  'freq_to_wdt' [-Werror,-Wunused-function]
static inline struct s3c2410_wdt *freq_to_wdt(struct notifier_block *nb)
                                  ^
drivers/watchdog/s3c2410_wdt.c:446:19: error: unused function
  's3c2410wdt_is_running' [-Werror,-Wunused-function]
static inline int s3c2410wdt_is_running(struct s3c2410_wdt *wdt)
                  ^
These functions are not used, so remove them.

Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230321183439.1826823-1-trix@redhat.com


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