Merge branch 'bugfix/dont_log_before_bss_inited' into 'master'

Merge branch 'bugfix/dont_log_before_bss_inited' into 'master'

Remove ESP_EARLY_LOGI before bss is initialized; it crashes the CPU

There's an ESP_EARLY_LOGI line that can get called before the BSS is initialized; the early logging code doesn't cope well with that: it checks if FreeRTOS is up, but the variables it uses for that contains garbage because it isn't cleared yet, giving the wrong result. The logging code then tries to set a mux, crashing the entire system. This patch removes the log line and adds a warning at the BSS initialization line not to do anything complex before that point.

Fixes https://github.com/espressif/esp-idf/issues/523

See merge request !671