arm64: versal: Do not place u-boot to reserved memory location

Versal can also have reserved space in DT which u-boot has to avoid to
placing self to that location. The same change was done in ZynqMP by commit
ce39ee28 ("zynqmp: Do not place u-boot to reserved memory location")
and also for microblaze by commit d7b5cc89 ("microblaze: Do not place
u-boot to reserved memory location").

The patch was tested by adding reserved-memory node to DT and check via
bdinfo back.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/15426fa6d64835dd23c5c8c12bbfc97306fb6098.1647527129.git.michal.simek@xilinx.com