Add BeagleBone AI-64 template

Add BeagleBone AI-64 template

This adds templates to build for the BeagleBoard.org BeagleBone AI-64 platform,
which is based on Texas Instruments J721e (TDA4VM) SoC.

https://www.beagleboard.org/boards/beaglebone-ai-64
https://www.ti.com/document-viewer/TDA4VM/datasheet/

Bug-AGL: SPEC-4941

Change-Id: Ie32a93178697907b6a71272af0bd3b1f453e1640
Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29351
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account