doc: Update Apollo Lake docs

[amyreye]

@gvancuts reported: Apollo Lake is no longer supported. Can we update this doc to show the output on Tiger Lake? https://projectacrn.github.io/latest/developer-guides/hld/hld-devicemodel.html

[dbkinder]

Additional references to "Apollo" should be scrubbed and updated:

developer-guides/hld/usb-virt-hld.rst:  On Apollo Lake platforms, the sysfs interface path is
developer-guides/hld/usb-virt-hld.rst:ACRN emulates the DRD hardware logic of an Apollo Lake platform to
developer-guides/hld/usb-virt-hld.rst:capabilities for the Apollo Lake platform, which supports the DRD
developer-guides/hld/hld-devicemodel.rst:On an Apollo Lake platform with Linux installed, we can see these tables using:
developer-guides/hld/hld-devicemodel.rst:shows a typical ACPI table layout in an Apollo Lake platform:
developer-guides/hld/hld-devicemodel.rst:   Typical ACPI Table Layout on Apollo Lake Platform
developer-guides/hld/hld-security.rst:single Apollo Lake-I SoC platform. See :numref:`security-ACRN`.
developer-guides/l1tf.rst:(including Apollo Lake) are immune to it. Currently, ACRN hypervisor
developer-guides/l1tf.rst:supports only Apollo Lake. Support for other core-based platforms is
developer-guides/l1tf.rst:There is no mitigation required on Apollo Lake based platforms.
reference/hardware.rst:| Apollo Lake            | | `NUC6CAYH`_,                     | .. rst-class::         | .. rst-class::         | .. rst-class::                                                                                    |
glossary.rst:      Apollo Lake platform
learn.rst:ACRN is supported on Apollo Lake and Kaby Lake Intel platforms,