enable wake-on-motion (WOM) for MPU6886 #122
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This adds a feature where the MPU6886 is able to wake the ESP32 core from deep-sleep when it detects motion. This should close issue #119 .
There is interest, per #119 , in having a more unified interrupt scheme between AXP, RTC, and IMU - the three devices with wired interrupt connections to GPIO35. This PR does not address that interest, but does enable wake-on-motion with the supplied example. The current MPU6886 interrupt configuration is "active-low" and "push-pull".