Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/watchdog/pc87413_wdt.c b/drivers/watchdog/pc87413_wdt.c
index 139d773..b7c1390 100644
--- a/drivers/watchdog/pc87413_wdt.c
+++ b/drivers/watchdog/pc87413_wdt.c
@@ -49,7 +49,7 @@
 #define WDT_DATA_IO_PORT    (WDT_INDEX_IO_PORT+1)
 #define SWC_LDN             0x04
 #define SIOCFG2             0x22	/* Serial IO register */
-#define WDCTL               0x10	/* Watchdog-Timer-Controll-Register */
+#define WDCTL               0x10	/* Watchdog-Timer-Control-Register */
 #define WDTO                0x11	/* Watchdog timeout register */
 #define WDCFG               0x12	/* Watchdog config register */