ARM: exynos: extend cpuidle support to P4 Note boards

The P4 Note family supports cpuidle, so allow it to make use of this
feature.

Signed-off-by: Martin Jücker <martin.juecker@gmail.com>
Link: https://lore.kernel.org/r/20201113212525.13455-6-martin.juecker@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>