selftest/sigaltstack: Use the AT_MINSIGSTKSZ aux vector if available

The SIGSTKSZ constant may not represent enough stack size in some
architectures as the hardware state size grows.

Use getauxval(AT_MINSIGSTKSZ) to increase the stack size.

Signed-off-by: Chang S. Bae <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Len Brown <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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