Fixed two typos in arch/powerpc/cpu/mpc83xx/start.S.

Signed-off-by: Horst Kronstorfer <hkronsto@frequentis.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

arch/powerpc/cpu/mpc83xx/start.S

@@ -507,7 +507,7 @@ init_e300_core: /* time t 10 */
 
 	lis	r3, CONFIG_SYS_IMMR@h
 #if defined(CONFIG_WATCHDOG)
-	/* Initialise the Wathcdog values and reset it (if req) */
+	/* Initialise the Watchdog values and reset it (if req) */
 	/*------------------------------------------------------*/
 	lis r4, CONFIG_SYS_WATCHDOG_VALUE
 	ori r4, r4, (SWCRR_SWEN | SWCRR_SWRI | SWCRR_SWPR)
@@ -520,7 +520,7 @@ init_e300_core: /* time t 10 */
 	li	r4, -0x55C7
 	sth	r4, SWSRR@l(r3)
 #else
-	/* Disable Wathcdog  */
+	/* Disable Watchdog  */
 	/*-------------------*/
 	lwz r4, SWCRR(r3)
 	/* Check to see if its enabled for disabling