ath6kl: Remove duplicate rtc_reg.h

Also remove unused rtc register definition from rtc_reg.h.
Signed-off-by: NVasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/ath6kl/miscdrv/common_drv.c

@@ -28,8 +28,8 @@
 #include "hw/mbox_host_reg.h"
 #include "AR6002/hw2.0/hw/si_reg.h"
 #include "AR6002/hw2.0/hw/gpio_reg.h"
-#include "AR6002/hw2.0/hw/rtc_reg.h"
 #include "AR6002/hw2.0/hw/vmc_reg.h"
+#include "hw/rtc_reg.h"
 #include "hw/mbox_reg.h"
 #include "hw/apb_map.h"