RTEMS | Draft: bsps/riscv/esp32: Disable the watchdogs bsp_start() means to disable (!1555)

[Sam Price (@TheSamPrice)]

Sam Price started a new discussion on bsps/riscv/esp32/start/bspstart.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161775

 > + *   field before any other register of the same watchdog timer can be
 > + *   changed."
 > + *
 > + * Each watchdog has its own write-key field, and the value is the same for
 > + * all of them:
 > + *
 > + *   Register 11.17, TIMG_WDTWPROTECT_REG (0x0064), page 300:
 > + *   "TIMG_WDT_WKEY If the register contains a different value than its
 > + *   reset value, write protection is enabled."  Its reset value is
 > + *   0x50d83aa1.
 > + *
 > + *   Register 9.37, RTC_CNTL_WDTWPROTECT_REG (0x00A8), page 254:
 > + *   "RTC_CNTL_WDT_WKEY If the register contains a different value than
 > + *   0x50d83aa1, write protection for the RTC watchdog (RWDT) is enabled."
 > + */
 > +#define WDT_WKEY_VALUE 0x50d83aa1U

**Reference code for the key value.** ESP-IDF unlocks both digital watchdogs with this value:
- Timer group watchdog: [`mwdt_ll_write_protect_disable()`](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/mwdt_ll.h#L241-L244) writes `0x50D83AA1` to `wdtwprotect.wdt_wkey`.
- RTC watchdog: [`RTC_CNTL_WDT_WKEY_VALUE`](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/rwdt_ll.h#L24) is `0x50D83AA1`, and [`rwdt_ll_write_protect_disable()`](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/rwdt_ll.h#L283-L286) writes it to `wdt_wprotect`.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161775
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