remoteproc: remote_core: initialize memory after ioremap

Initialize memory after ioremap.

This is necessary in case part of firmware is in TCM.
If we do not do the memory initialization after ioremap,
Kernel will output "Bad mode in Synchronous Abort handler detected"
error after it writes to the memory.
TCM needs to be written before reading to initialize ECC there.
This functionality should be moved to early stages (FSBL) that's why
this is just workaround for now.

Signed-off-by: Wendy Liang <jliang@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>