Build: Extend LLVM toolchain support for MPS2/3

Add support for: an519, an524, cs300/* cs310/*, musca_s1, musca_b1

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: I71fd040cc3c02813645521f18e25a175fa0f847c
8 files changed