perf: arm_spe: Print the version of SPE detected

There's up to 4 versions of SPE now. Let's add the version that's been
detected to the driver's informational print out.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230206204746.1452942-1-robh@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>