fix(esp_libc): add missing stdint include (IDFGH-17572)

[KaeLL]

Motivation

In file included from /esp-idf/components/esp_libc/src/timekeeping.c:20:
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:8:1: error: unknown type name 'uint64_t'
    8 | uint64_t esp_time_impl_get_time(void);
      | ^~~~~~~~
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:1:1: note: 'uint64_t' is defined in header '<stdint.h>'; this is probably fixable by adding '#include <stdint.h>'
  +++ |+#include <stdint.h>
    1 | /*
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:10:1: error: unknown type name 'uint64_t'
   10 | uint64_t esp_time_impl_get_time_since_boot(void);
      | ^~~~~~~~
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:10:1: note: 'uint64_t' is defined in header '<stdint.h>'; this is probably fixable by adding '#include <stdint.h>'
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:12:1: error: unknown type name 'uint32_t'
   12 | uint32_t esp_time_impl_get_time_resolution(void);
      | ^~~~~~~~
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:12:1: note: 'uint32_t' is defined in header '<stdint.h>'; this is probably fixable by adding '#include <stdint.h>'
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:14:34: error: unknown type name 'uint64_t'
   14 | void esp_time_impl_set_boot_time(uint64_t t);
      |                                  ^~~~~~~~
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:14:34: note: 'uint64_t' is defined in header '<stdint.h>'; this is probably fixable by adding '#include <stdint.h>'
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:16:1: error: unknown type name 'uint64_t'
   16 | uint64_t esp_time_impl_get_boot_time(void);
      | ^~~~~~~~
/esp-idf/components/esp_libc/priv_include/esp_time_impl.h:16:1: note: 'uint64_t' is defined in header '<stdint.h>'; this is probably fixable by adding '#include <stdint.h>'
/esp-idf/components/esp_libc/src/timekeeping.c: In function 'esp_libc_timekeeping_adjust_boot_time':
/esp-idf/components/esp_libc/src/timekeeping.c:62:13: error: implicit declaration of function 'esp_time_impl_set_boot_time'; did you mean 'esp_time_impl_get_boot_time'? [-Wimplicit-function-declaration]
   62 |             esp_time_impl_set_boot_time(boot_time);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
      |             esp_time_impl_get_boot_time

---

Note

Low Risk
Low risk: adds a missing standard header include to fix build errors for uint32_t/uint64_t declarations, with no behavioral changes.

Overview
Fixes a compile failure in esp_time_impl.h by adding #include <stdint.h> so the uint32_t/uint64_t timekeeping function declarations are properly typed.

^{Reviewed by Cursor Bugbot for commit d0772f0. Bugbot is set up for automated code reviews on this repo. Configure here.}

[SoucheSouche]

Hi @KaeLL, thanks for the contribution. The change looks ok, I will submit it for internal review.