meta-speech-framework: Update Alexa Auto SDK wakeword support for v2.3

meta-speech-framework: Update Alexa Auto SDK wakeword support for v2.3

Update the agl-voiceagent-alexa-wakeword feature template for v2.3:
- Added a scriptlet to handle installing and patching the amazonlite
  zip file contents.  The amazonlite-2.3.zip file is now expected to
  be in the directory set with the XDG_DOWNLOAD_DIR environment
  variable, and if that is not set, it will use $HOME/Downloads (i.e.
  the same behavior as the rcar3 graphics support files).
- Added a patch to tweak a couple of things in the amazonlite layer
  to fix building against Yocto dunfell.

Bug-AGL: SPEC-3783

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I75783860e4ce332ba89e8a7768fe4ff7367bcd93