zephyr: Update include path to disk_access.h.

The disk_access header was moved to a different path in Zephyr v2.6.0.
The old path was deprecated for two releases (v2.6.0 and v2.7.0) and
will no longer be supported after Zephyr v2.7.0.

Signed-off-by: Maureen Helm <maureen.helm@intel.com>

ports/zephyr/zephyr_storage.c

@@ -32,7 +32,7 @@
 #endif
 
 #ifdef CONFIG_DISK_ACCESS
-#include <disk/disk_access.h>
+#include <storage/disk_access.h>
 #endif
 
 #ifdef CONFIG_FLASH_MAP