Fix initialization macros for twai_timing_config_t not setting .clk_src and .brp (IDFGH-10134)

[JustinOng]

.clk_src and .brp of twai_timing_config_t are not set by the TWAI_TIMING_CONFIG_* macros.

The examples declare twai_timing_config_t globally and are thus zero-initialized (eg twai_self_test).

However, the C++ compiler warns about this:

/opt/esp/idf/components/hal/include/hal/twai_types.h:78:135: warning: missing initializer for member 'twai_timing_config_t::clk_src' [-Wmissing-field-initializers]
   78 | #define TWAI_TIMING_CONFIG_25KBITS()    {.quanta_resolution_hz = 625000, .tseg_1 = 16, .tseg_2 = 8, .sjw = 3, .triple_sampling = false}
      |                                                                                                                                       ^
/opt/esp/idf/examples/peripherals/twai/twai_self_test/main/twai_self_test_example_main.cpp:41:46: note: in expansion of macro 'TWAI_TIMING_CONFIG_25KBITS'
   41 | static const twai_timing_config_t t_config = TWAI_TIMING_CONFIG_25KBITS();
      |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~
/opt/esp/idf/components/hal/include/hal/twai_types.h:78:135: warning: missing initializer for member 'twai_timing_config_t::brp' [-Wmissing-field-initializers]
   78 | #define TWAI_TIMING_CONFIG_25KBITS()    {.quanta_resolution_hz = 625000, .tseg_1 = 16, .tseg_2 = 8, .sjw = 3, .triple_sampling = false}
      |                                                                                                                                       ^
/opt/esp/idf/examples/peripherals/twai/twai_self_test/main/twai_self_test_example_main.cpp:41:46: note: in expansion of macro 'TWAI_TIMING_CONFIG_25KBITS'
   41 | static const twai_timing_config_t t_config = TWAI_TIMING_CONFIG_25KBITS();
      |                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~

, and there are potential issues if twai_timing_config_t is declared on the stack without being initialized fully.

[Alvin1Zhang]

Thanks for your contribution.

[suda-morris]

sha=a18d7e24d6efa86ced17e74867e6537e5cbe617e

[nebkat]

Needs backport to release/v5.1.

[wanckl]

@nebkat Hello, This fix is plain to including in v5.1.1 next month. if you are emergency to this fix, please tell me, I can give you a patch, but there will no full release test for this patch, So if you have mass produced, need consider the risk from this patch.
Although this little fix seems no any risks.

[nebkat]

@wanckl This is just a compiler warning so not critical.

However #11331 is a regression in v5.1 - might be worth noting it somewhere until it is fixed. I have cherry-picked it already so no need for a patch for me (though perhaps others will need one).