Documentation: gpio: Fix IRQ mask and unmask examples

After switching to immutable IRQ chips for GPIO drivers the examples become
uncompilable due to wrong IRQ API, i.e. irq_desc_get_handler_data() in use.
Replace it with proper irq_data_get_irq_chip_data() call where it applies.

Fixes: 5644b66 ("Documentation: Update the recommended pattern for GPIO irqchips")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Author: andy-shev

Documentation/driver-api/gpio/driver.rst

@@ -429,7 +429,7 @@ call into the core gpiolib code:
 
   static void my_gpio_mask_irq(struct irq_data *d)
   {
-      struct gpio_chip *gc = irq_desc_get_handler_data(d);
+      struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 
       /*
        * Perform any necessary action to mask the interrupt,
@@ -442,7 +442,7 @@ call into the core gpiolib code:
 
   static void my_gpio_unmask_irq(struct irq_data *d)
   {
-      struct gpio_chip *gc = irq_desc_get_handler_data(d);
+      struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 
       gpiochip_enable_irq(gc, d->hwirq);
 
@@ -501,7 +501,7 @@ the interrupt separately and go with it:
 
   static void my_gpio_mask_irq(struct irq_data *d)
   {
-      struct gpio_chip *gc = irq_desc_get_handler_data(d);
+      struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 
       /*
        * Perform any necessary action to mask the interrupt,
@@ -514,7 +514,7 @@ the interrupt separately and go with it:
 
   static void my_gpio_unmask_irq(struct irq_data *d)
   {
-      struct gpio_chip *gc = irq_desc_get_handler_data(d);
+      struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 
       gpiochip_enable_irq(gc, d->hwirq);
 
@@ -576,7 +576,7 @@ In this case the typical set-up will look like this:
 
   static void my_gpio_mask_irq(struct irq_data *d)
   {
-      struct gpio_chip *gc = irq_desc_get_handler_data(d);
+      struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 
       /*
        * Perform any necessary action to mask the interrupt,
@@ -590,7 +590,7 @@ In this case the typical set-up will look like this:
 
   static void my_gpio_unmask_irq(struct irq_data *d)
   {
-      struct gpio_chip *gc = irq_desc_get_handler_data(d);
+      struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 
       gpiochip_enable_irq(gc, d->hwirq);