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 <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-33-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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