nrf/main: Allocate executable memory when needed.

This commit lets the nRF port use the new
MICROPY_PERSISTENT_CODE_LOAD_NATIVE configuration entry.

The nRF port needs a special procedure to allocate memory used to hold
executable native code.  This functionality was gated behind the
presence of a native emitter and thus its inclusion condition had to be
updated.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

Author: agatti

ports/nrf/main.c

@@ -368,7 +368,7 @@ void MP_WEAK __assert_func(const char *file, int line, const char *func, const c
     __fatal_error("Assertion failed");
 }
 
-#if MICROPY_EMIT_MACHINE_CODE
+#if MICROPY_EMIT_INLINE_THUMB || MICROPY_ENABLE_NATIVE_CODE
 void *nrf_native_code_commit(void *buf, unsigned int len, void *reloc) {
     (void)len;
     if (reloc) {