[MIPS] INCA-IP: Move watchdog init code from start.S to lowlevel_init()

Move things to appropriate place.

Signed-off-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
diff --git a/board/incaip/lowlevel_init.S b/board/incaip/lowlevel_init.S
index 14d738a..b39f93d 100644
--- a/board/incaip/lowlevel_init.S
+++ b/board/incaip/lowlevel_init.S
@@ -276,6 +276,12 @@
 	.ent	lowlevel_init
 lowlevel_init:
 
+	/* Disable Watchdog.
+	 */
+	la	t9, disable_incaip_wdt
+	jalr	t9
+	nop
+
 	/* EBU, CGU and SDRAM Initialization.
 	 */
 	li	a0, CPU_CLOCK_RATE