ARM: dts: s5pv210: Switch to S5Pv210 specific pinctrl wakeup compatible

The pin controller block of S5Pv210 for handling external wakeup
interrupts is different than in newer designs (Exynos).

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Tomasz Figa <tomasz.figa@gmail.com>
Cc: Sylwester Nawrocki <snawrocki@kernel.org>
Acked-by: Tomasz Figa <tomasz.figa@gmail.com>