am33xx, davinci: Create and use <asm/davinci_rtc.h>

Create a common header file for the RTC IP block that is shared between
davinci and am33xx.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/drivers/bootcount/bootcount_davinci.c b/drivers/bootcount/bootcount_davinci.c
index efa4d42..eddd940 100644
--- a/drivers/bootcount/bootcount_davinci.c
+++ b/drivers/bootcount/bootcount_davinci.c
@@ -6,8 +6,7 @@
  */
 
 #include <bootcount.h>
-#include <asm/arch/da850_lowlevel.h>
-#include <asm/arch/davinci_misc.h>
+#include <asm/davinci_rtc.h>
 
 void bootcount_store(ulong a)
 {