nds32/ag101: clean up for SoC related code

Remove unneccessary codes.
1. Clean up for cpu related code.
2. Clean up for timer related code.

Signed-off-by: Macpaul Lin <macpaul@andestech.com>
diff --git a/arch/nds32/cpu/n1213/ag101/cpu.c b/arch/nds32/cpu/n1213/ag101/cpu.c
index 0ab666e..c2636b1 100644
--- a/arch/nds32/cpu/n1213/ag101/cpu.c
+++ b/arch/nds32/cpu/n1213/ag101/cpu.c
@@ -45,10 +45,6 @@
  */
 int cleanup_before_linux(void)
 {
-#ifdef CONFIG_MMU
-	unsigned long i;
-#endif
-
 	disable_interrupts();
 
 #ifdef CONFIG_MMU
@@ -123,8 +119,8 @@
 
 void flush_cache(unsigned long addr, unsigned long size)
 {
-	dcache_flush_range(addr , addr + size);
-	icache_inval_range(addr , addr + size);
+	dcache_flush_range(addr, addr + size);
+	icache_inval_range(addr, addr + size);
 }
 
 void icache_enable(void)