zephyr: including fs_interface.h

`fs_file_t` and `fs_dir_t` is defined in fs_interface.h.
However, platform_internal.h does not currently include it,
so the symbols can't be resolved.
We include it to resolve these definitions with
platform_internal.h standalone.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: soburi

core/shared/platform/zephyr/platform_internal.h

@@ -38,13 +38,15 @@
 
 #if KERNEL_VERSION_NUMBER < 0x030200 /* version 3.2.0 */
 #include <zephyr.h>
+#include <fs/fs_interface.h>
 #include <net/net_pkt.h>
 #include <net/net_if.h>
 #include <net/net_ip.h>
 #include <net/net_core.h>
 #include <net/net_context.h>
 #else /* else of KERNEL_VERSION_NUMBER < 0x030200 */
 #include <zephyr/kernel.h>
+#include <zephyr/fs/fs_interface.h>
 #include <zephyr/net/net_pkt.h>
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/net_ip.h>