[Embedded] add provisional support for building armv6(m) eabi embedded targets #69258
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This allows a compiler to be built that supports emitting code for armv6-none-none-eabi targets (which are commonly used for systems like RP2040, Arduino Uno R4 and others).
This does not provide a standard library, libc, compiler c runtime, linker, assembler, or librarian.
This does provide the knowledge to the compiler that target triple exists.