ARM: tegra: fix a typo in the tegra114.dtsi

The reg property for node spi@7000d800 was wrong. Fix it to match the
HW. This change was verified against the Linux kernel.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>