Dynamically enable LSE for aarch64 rust provided intrinsics

Create a private module to hold the bootstrap code needed enable LSE
at startup on aarch64-*-linux-* targets when rust implements the
intrinsics.

This is a bit more heavyweight than compiler-rt's LSE initialization,
but has the benefit of initializing the aarch64 cpu feature detection
for other uses.

Using the rust initialization code does use some atomic operations,
that's OK. Mixing LSE and non-LSE operations should work while the
update flag propagates.

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