kselftest/arm64: sme: Provide streaming mode SVE stress test

One of the features of SME is the addition of streaming mode, in which we
have access to a set of streaming mode SVE registers at the SME vector
length. Since these are accessed using the SVE instructions let's reuse
the existing SVE stress test for testing with a compile time option for
controlling the few small differences needed:

 - Enter streaming mode immediately on starting the program.
 - In streaming mode FFR is removed so skip reading and writing FFR.

Signed-off-by: Mark Brown <[email protected]>
Reviewed-by: Shuah Khan <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

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