Merge pull request #3757 from 0xc0170/fix_ncs36510_lpticker

ncs36510: lp ticker - remove unused header file inclusion (sleep)

Author: sg-

targets/TARGET_ONSEMI/TARGET_NCS36510/ncs36510_lp_ticker_api.c

@@ -34,12 +34,10 @@
 #include "device.h"
 #if DEVICE_LOWPOWERTIMER
 
-#include "sleep_api.h"
 #include "cmsis_nvic.h"
 #include "lp_ticker_api.h"
 #include "rtc.h"
 #include "rtc_map.h"
-#include "sleep.h"
 
 /* Initialize the RTC for low power ticker */
 void lp_ticker_init()