nios2: Switch to generic timer

Zap almost all of the ad-hoc timer code from interrupts.c and
use the code in lib/time.c instead.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
diff --git a/common/board_f.c b/common/board_f.c
index 613332e..8bb8ded 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -795,7 +795,8 @@
 	init_timebase,
 #endif
 #if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || \
-		defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32)
+		defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32) || \
+		defined(CONFIG_NIOS2)
 	timer_init,		/* initialize timer */
 #endif
 #ifdef CONFIG_SYS_ALLOC_DPRAM