ESP32C3 stability improvements

[l0ud]

This PR contains my recent findings when enabling ESP32C3 board. With this changes the following issues are fixed:

• BMI160 shaky/not functional/completely drifty before calibration (because of uninitialized memory)
• BMI160 being broken after some amount of time, especially on rest ( may help with AUX BMI160 tracker doesn't wake up from rest on 0.3.3 #245 ) when temperature calibration is enabled (default).
• (Possibly) other sensors with calibration stored in tracker being broken before performing it.
• Trackers with AUX IMU compiled but not connected making server going crazy with OK/Error status changing every second (workaround for ESP32C3 Wire I2C - SCL hang and 1 second timeout on transfer performed after NAK espressif/arduino-esp32#8454 )

[nekomona]

LGTM now -w-/