arm64: tegra: Remove unused property for I2C

Commit 156af9de ("arm64: tegra: Add Tegra234 I2C devicetree nodes")
populated the I2C device nodes for Tegra234. One of these nodes
contains the property 'nvidia,hw-instance-id' which is neither
documented or used. Remove this unused property.

Fixes: 156af9de ("arm64: tegra: Add Tegra234 I2C devicetree nodes")
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>