rtc-twl4030 header cleanup

Portability fixes (simplifications) for rtc-twl4030:  don't include
so many needless headers, especially platform-specific ones.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/rtc/rtc-twl4030.c

@@ -21,23 +21,15 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
-#include <linux/ioport.h>
-#include <linux/delay.h>
 #include <linux/types.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/platform_device.h>
-#include <linux/spinlock.h>
 #include <linux/interrupt.h>
-#include <linux/device.h>
+
 #include <linux/i2c/twl4030.h>
 #include <linux/i2c/twl4030-rtc.h>
-#include <linux/io.h>
-#include <linux/irq.h>
 
-#include <asm/mach/time.h>
-#include <asm/system.h>
-#include <mach/hardware.h>
 
 #define ALL_TIME_REGS		6