[bsp][asm9260t] modify file name to lowercase.

bsp/asm9260t/platform/timer0.c

@@ -23,7 +23,7 @@
  */
 
 #include "timer0.h"
-#include "ASM9260T.h"
+#include "asm9260t.h"
 #include "rtthread.h"
 void hw_timer0_init(void)
 {

bsp/asm9260t/platform/uart.c

@@ -22,7 +22,7 @@
  * 2015-04-14     ArdaFu      first version
  */
  
-#include "ASM9260T.h"
+#include "asm9260t.h"
 #include "rtthread.h"
 #include "uart.h"