gpio: timberdale: repair kernel-doc comments

Use a ':' after struct member names to avoid kernel-doc warnings:

Warning: include/linux/timb_gpio.h:22 struct member 'gpio_base' not
 described in 'timbgpio_platform_data'
Warning: include/linux/timb_gpio.h:22 struct member 'nr_pins' not
 described in 'timbgpio_platform_data'
Warning: include/linux/timb_gpio.h:22 struct member 'irq_base' not
 described in 'timbgpio_platform_data'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260301014822.3133268-1-rdunlap@infradead.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

Author: rddunlap

include/linux/timb_gpio.h

@@ -9,10 +9,10 @@
 
 /**
  * struct timbgpio_platform_data - Platform data of the Timberdale GPIO driver
- * @gpio_base		The number of the first GPIO pin, set to -1 for
+ * @gpio_base:		The number of the first GPIO pin, set to -1 for
  *			dynamic number allocation.
- * @nr_pins		Number of pins that is supported by the hardware (1-32)
- * @irq_base		If IRQ is supported by the hardware, this is the base
+ * @nr_pins:		Number of pins that is supported by the hardware (1-32)
+ * @irq_base:		If IRQ is supported by the hardware, this is the base
  *			number of IRQ:s. One IRQ per pin will be used. Set to
  *			-1 if IRQ:s is not supported.
  */