Add bh_print_proc_mem() to dump memory info of current process (#1734)

Only support Posix platforms currently, read memory consumption info from
file "/proc/self/status".

core/shared/platform/zephyr/zephyr_platform.c

@@ -85,6 +85,12 @@ void
 os_free(void *ptr)
 {}
 
+int
+os_dumps_proc_mem_info(char *out, unsigned int size)
+{
+    return -1;
+}
+
 #if 0
 struct out_context {
     int count;