This involves doing something similar to #36159 but spanning multiple directories. More specifically, we need to:

• Rename and update generic-sensor/generic-sensor-feature-policy-test.sub.js
• Move feature-policy/reporting/generic-sensor-reporting.https.html and feature-policy/resources/feature-policy-generic-sensor.html to permissions-policy/.
• Update headers and rename tests in:
  • accelerometer
  • ambient-light
  • geolocation-sensor
  • gyroscope
  • magnetometer
  • orientation-sensor
  • proximity