ARM: tegra: p2771-0000: enable PIE relocation

U-Boot is configured to build as position independent executable. Enable
relocation of RELA section required to work with different load
addresses.

Signed-off-by: Vishruth <vishruthj@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Peter Robinson <probinson@gmail.com>