arm64: smp: Bump debugging information print down to KERN_DEBUG

This sort of information is only generally useful when debugging.

No need to have these sprinkled through the kernel log otherwise.

Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210617073059.315542-1-lee.jones@linaro.org


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