nrf52_bsim: Add replacement for nrfx's nrfx_coredep_delay_us()

Provide a replacement for this board for the nordic HAL nrfx
nrfx_coredep_delay_us()
This function is a busy wait, which in the HAL relies on
the ARM DWT or assembler, but which in this board can just
utilize the same busy_wait mechanism provided for k_busy_wait()

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

boards/posix/nrf52_bsim/CMakeLists.txt

@@ -30,6 +30,7 @@ zephyr_library_sources(
 	time_machine.c
 	trace_hook.c
 	cmsis.c
+	soc/nrfx_coredep.c
 )
 
 zephyr_library_include_directories(

boards/posix/nrf52_bsim/soc/nrfx_coredep.c

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2023 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+#include <kernel_internal.h>
+
+/*
+ * Replacement for the nrfx nrfx_coredep_delay_us()
+ * which busy waits for the given number of microseconds.
+ *
+ * This function will replace at *link* time the
+ * nrfx one which had been marked as weak.
+ */
+void nrfx_coredep_delay_us(uint32_t time_us)
+{
+	if (time_us == 0) {
+		return;
+	}
+	arch_busy_wait(time_us);
+}