Enable GPIO support for PCA9532

configname: CONFIG_LEDS_PCA9532_GPIO

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>GPIO Support
└─>Enable GPIO support for PCA9532
In linux kernel since version 3 (release Date: 2011-07-21)  
Allow unused pins on PCA9532 to be used as gpio.

To use a pin as gpio pca9532_type in pca9532_platform data needs to
set to PCA9532_TYPE_GPIO.