fix(PeriphDrivers): MSDK-1245: Re-order VSSEL selection to avoid possible damages on pads

[ahmetalincak]

Description

Voltage Rail selection should be made before padding configuration. A hesitation came from Clayton:

For the MXC_GPIO_Config function, the last thing done is to select the voltage rail (gpio_me18.c). This creates a situation where damage to the part can occur. The GPIO on parts with multiple rails defaults to VDDIO (1.8V) with pullup/pulldown disabled. If a customer has 3.0V on a GPIO pin (say I2C pullups), and the code turns on the pullup before selecting the VDDIOH rail, the 3.0V back powers VDDIO, potentially causing damage to the pads.

[Jake-Carter]

This makes sense. Thanks @cwarer1 and @ahmetalincak