backtrace: fix ci build error

Signed-off-by: ligd <liguiding1@xiaomi.com>

Author: GUIDINGLI

arch/arm/src/common/arm_backtrace_unwind.c

@@ -25,7 +25,7 @@
 #include <nuttx/config.h>
 
 #include <nuttx/arch.h>
-#include <nuttx/elf.h>
+#include <arch/elf.h>
 
 #include "sched/sched.h"
 #include "arm_internal.h"

include/nuttx/elf.h

@@ -28,7 +28,9 @@
  ****************************************************************************/
 
 #include <elf.h>
-#include <arch/elf.h>
+#ifdef CONFIG_LIBC_ARCH_ELF
+#  include <arch/elf.h>
+#endif
 #include <stdbool.h>
 
 /****************************************************************************

libs/libc/machine/arm/gnu_unwind_find_exidx.c

@@ -24,7 +24,8 @@
  * Included Files
  ****************************************************************************/
 
-#include <nuttx/elf.h>
+#include <elf32.h>
+#include <arch/elf.h>
 #include <unwind.h>
 
 /****************************************************************************