fix(newlib): fix CONFIG_LIBC_OPTIMIZED_MISALIGNED_ACCESS for c2/c3/c6/h2/h21

PMP configurations for load and store addresses may
have different permissions (e.g., "R" vs. "RW").

Due to the timing alignment of internal signals, the address
permission check may be incorrectly applied during the second
part of a misaligned access transaction.

As a workaround, insert two instructions (e.g. ADDI/NOP) between
accessing to different memory regions. This spacing avoids the
false permission check caused by signal timing overlap.

components/newlib/src/string/memcmp.c

@@ -6,9 +6,8 @@
  * SPDX-FileContributor: 2025 Espressif Systems (Shanghai) CO LTD
  */
 #include <string.h>
-#include "local.h"
+#include "string/local.h"
 
-__attribute__((optimize("-Os")))
 int
 memcmp(const void *m1,
        const void *m2,