Look controls hmdEnabled:false seems to be ignored

Description:
I would expect the configuration enabled: true; hmdEnabled: false; touchEnabled: true; to only take touch input, but gyroscope controls are still enabled. In issue #4095, the look-controls component is entirely disabled. But I would like touch controls to stay enabled while having the ability to toggle on & off gyroscope controls.

The source code for look-controls will reset yaw & pitch when you set hmdEnabled to false, but it will not actually do anything else with that setting, and will still read continue to read and apply data from hmd:
https://github.com/aframevr/aframe/blob/master/src/components/look-controls.js#L79

In past versions, I would rewrite look-controls and implement hmdEnabled myself. Last version I did this for was 0.9.2. If I'm understanding the purpose of hmdEnabled correctly, and this is a bug, I can open a PR for the latest version.

• A-Frame Version: 1.0.4
• Platform / Device: iOS 13.3.1 / iPhone 8, Android Chrome 80.0.3987.132 / Android 9 / motorola one zoom
• Reproducible Code Snippet or URL: https://rust-low-camp.glitch.me

Start in src/components/look-controls.js around line 79 and reproduce the behavior with the linked Glitch example using hmdEnabled:false and touchEnabled:true. Trace how HMD data is read and applied, then verify that gyroscope input is ignored while touch look controls remain enabled.