watchdog: ath79_wdt: switch to clk_prepare/clk_disable

Replace clk_enable() and clk_disable() calls with
clk_prepare_enable() and clk_disable_unprepare()
to get ready for the migration to the common clock
framework.

Signed-off-by: Gabor Juhos <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
1 file changed