boards: remove pinmux configuration for kinetis boards using adc12

Remove pinmux configuration for kinetis boards using adc12, as pinctrl
is supported by driver

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

boards/arm/twr_ke18f/pinmux.c

@@ -39,12 +39,6 @@ static int twr_ke18f_pinmux_init(const struct device *dev)
 	__ASSERT_NO_MSG(device_is_ready(porte));
 #endif
 
-#if DT_NODE_HAS_STATUS(DT_NODELABEL(adc0), okay) && CONFIG_ADC
-	/* Thermistor A, B */
-	pinmux_pin_set(porta, 0, PORT_PCR_MUX(kPORT_PinDisabledOrAnalog));
-	pinmux_pin_set(porta, 1, PORT_PCR_MUX(kPORT_PinDisabledOrAnalog));
-#endif
-
 #if (DT_NODE_HAS_STATUS(DT_NODELABEL(adc0), okay) && CONFIG_ADC) || \
     (DT_NODE_HAS_STATUS(DT_NODELABEL(cmp2), okay) && CONFIG_MCUX_ACMP)
 	/* Potentiometer */