gpio: stmpe: Staticize non-exported symbols

Both stmpe_gpio_irq_map() and stmpe_gpio_irq_unmap() are not referenced
outside of this file, make them static.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-stmpe.c

@@ -271,8 +271,8 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-int stmpe_gpio_irq_map(struct irq_domain *d, unsigned int virq,
-		       irq_hw_number_t hwirq)
+static int stmpe_gpio_irq_map(struct irq_domain *d, unsigned int virq,
+			      irq_hw_number_t hwirq)
 {
 	struct stmpe_gpio *stmpe_gpio = d->host_data;
 
@@ -292,7 +292,7 @@ int stmpe_gpio_irq_map(struct irq_domain *d, unsigned int virq,
 	return 0;
 }
 
-void stmpe_gpio_irq_unmap(struct irq_domain *d, unsigned int virq)
+static void stmpe_gpio_irq_unmap(struct irq_domain *d, unsigned int virq)
 {
 #ifdef CONFIG_ARM
 	set_irq_flags(virq, 0);