pinctrl: freescale: Fix a memory out of bounds when num_configs is 1

In the Linux kernel, the following vulnerability has been resolved:

pinctrl: freescale: Fix a memory out of bounds when num_configs is 1

The config passed in by pad wakeup is 1, when num_configs is 1,

Configuration [1] should not be fetched, which will be detected

by KASAN as a memory out of bounds condition. Modify to get

configs[1] when num_configs is 2.