drivers: gpio: fix misuse of u8_t where bool is intended

GPIO configuration flags will move and some that used to be in the low
8 bits are now higher, resulting in implicit constant conversion
overflows.  Use a boolean data type to hold boolean values.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>

drivers/gpio/gpio_dw.c

@@ -154,7 +154,7 @@ static inline void dw_interrupt_config(struct device *port, int access_op,
 	struct gpio_dw_runtime *context = port->driver_data;
 	const struct gpio_dw_config *config = port->config->config_info;
 	u32_t base_addr = dw_base_to_block_base(context->base_addr);
-	u8_t flag_is_set;
+	bool flag_is_set;
 
 	ARG_UNUSED(access_op);
 

drivers/gpio/gpio_qmsi.c

@@ -171,7 +171,7 @@ static void gpio_qmsi_callback(void *data, u32_t status)
 	}
 }
 
-static void qmsi_write_bit(u32_t *target, u8_t bit, u8_t value)
+static void qmsi_write_bit(u32_t *target, u8_t bit, bool value)
 {
 	if (value) {
 		sys_set_bit((uintptr_t) target, bit);

drivers/gpio/gpio_qmsi_ss.c

@@ -143,7 +143,7 @@ static void ss_gpio_qmsi_callback(void *data, uint32_t status)
 	}
 }
 
-static void ss_qmsi_write_bit(u32_t *target, u8_t bit, u8_t value)
+static void ss_qmsi_write_bit(u32_t *target, u8_t bit, bool value)
 {
 	if (value) {
 		sys_set_bit((uintptr_t) target, bit);