ARM: dts: s3c64xx: drop unneeded pinctrl wake-up interrupt mapping

Simplify the nodes of S3C64xx pin controller with wake-up interrupts by
removing the artificial pinctrl-interrupt-map mapping node and use
interrupts-extended.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20220111201722.327219-3-krzysztof.kozlowski@canonical.com