boards: lpcxpresso55s69: Fix use of deprecated macro
boards: lpcxpresso55s69: Fix use of deprecated macro

In board pinmux.c ifdef of the form DT_GPIO_KEYS_SWx_GPIO_CONTROLLER
should be DT_GPIO_KEYS_SWx_GPIOS_CONTROLLER.

Signed-off-by: Kumar Gala <a5e5248af4cd4f0ed8c515f61d40a6e2db46a66e@linaro.org>

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