staging: mt7621-pci: release gpios after pci initialization

R3G's LEDs fail to initialize because one of them uses GPIO8
Hence, release the GPIO resources after PCIe initialization
and properly release also in driver error path.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20200313200913.24321-6-sergio.paracuellos@gmail.com


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