ARM: tegra: use TEGRA_GPIO() in a couple more places

A couple of references to Tegra GPIO numbers were missed when cleaning
up the Tegra DT files. Convert them now.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

diff --cc arch/arm/boot/dts/tegra20-seaboard.dts
Simple merge

diff --cc arch/arm/boot/dts/tegra20-trimslice.dts
Simple merge