run I2C at full freq

main/ugv_io_mpu.cc

@@ -43,7 +43,7 @@ void MPU::Init() {
   mpu_bus_ = &i2c1;
   // This is shared with the oled, so just use those pins
   mpu_bus_->setTimeout(10);
-  mpu_bus_->begin(MPU_SDA, MPU_SCL, 100000);
+  mpu_bus_->begin(MPU_SDA, MPU_SCL, 400000);
   mpu_ = new mpud::MPU(*mpu_bus_);
 
   esp_err_t ret;