Add Corstone-1000 mps3 support
Add support for Corstone1000-MPS3 FPGA board https://developer.arm.com/documentation/102360/0000.
The Corstone1000 platform firmware needs to built using libc-musl library. Therefore, introduced a new Yocto multiconfig meta-cassini-bsp/conf/multiconfig/firmware.conf
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Added sanity test to validate Cassini distro booting on Corstone1000-mps3 FPGA board.
This MR adds fixes for some CI rules, abbreviation and licensing header