staging: mt7621-pci: avoid to set gpio mode in driver

Gpio mode for the pcie pins must be request from device
tree using pinctrl driver. Pinctrl driver is already setting
this pcie pins as GPIO if it is requested. Hence, remove it
from here.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20210505121736.6459-3-sergio.paracuellos@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>