ARM: tegra: config: disable firmware loading

ARM: tegra: config: disable firmware loading

disable firmware loading by Realtek 8169 driver.

Bug 1481697

Change-Id: Ie0413caf9029d5515d862429956c386f16082553
Signed-off-by: Preetham Chandru R <pchandru@nvidia.com>
Reviewed-on: http://git-master/r/394645
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Tested-by: Bibek Basu <bbasu@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Eric Brower <ebrower@nvidia.com>
Reviewed-by: Matthew Pedro <mapedro@nvidia.com>