crypto: curve25519-x86_64: solve register constraints with reserved registersHEADmaster

The register constraints for the inline assembly in fsqr() and fsqr2()
are pretty tight on what the compiler may assign to the remaining three
register variables. The clobber list only allows the following to be
used: RDI, RSI, RBP and R12. With RAP reserving R12 and a kernel having
CONFIG_FRAME_POINTER=y, claiming RBP, there are only two registers left
so the compiler rightfully complains about impossible constraints.

Provide alternatives that'll allow a memory reference for 'out' to solve
the allocation constraint dilemma for this configuration.

Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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