xilinx: Remove scriptaddr from config files and move it to DT

xilinx: Remove scriptaddr from config files and move it to DT

Define bootscript address in RAM via DT property and remove it from config
file. Adding default value to common DTSI. Platform DT description can
remove this property or rewrite it.

In Zynq case scriptaddr property was defined twice for no reason.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/d36ffeb00ed8f0ca4bb67d4983d1852d01ade637.1691067102.git.michal.simek@amd.com