[nrf noup] boot: zephyr: remove nonsecure ram cleanup

This leads to stack corruption.

Signed-off-by: Mateusz Michalek <mateusz.michalek@nordicsemi.no>

Author: michalek-no

boot/zephyr/main.c

@@ -224,9 +224,6 @@ static void do_boot(struct boot_rsp *rsp)
 #if CONFIG_MCUBOOT_NRF_CLEANUP_PERIPHERAL
     nrf_cleanup_peripheral();
 #endif
-#if CONFIG_MCUBOOT_NRF_CLEANUP_NONSECURE_RAM && defined(PM_SRAM_NONSECURE_NAME)
-    nrf_cleanup_ns_ram();
-#endif
 #if CONFIG_MCUBOOT_CLEANUP_ARM_CORE
     cleanup_arm_nvic(); /* cleanup NVIC registers */