arm64: zynqmp: Print an error for split to lock mode switch

arm64: zynqmp: Print an error for split to lock mode switch

The zynqmp tcminit crashes the U-Boot when switching from
r5-mode "split" to "lockstep" instead it should throw an error.
When cpu is enabled, the check_tcm_mode() function checks
if the previous mode is "split", switch mode is "lockstep" then
it returns the error code and the initialize_tcm() function is not
updating the global control register of the RPU instead it prints
the error message. When cpu is disabled, the check_tcm_mode()
function returns the success code for switch split to lockstep mode.

Signed-off-by: Padmarao Begari <padmarao.begari@amd.com>
Link: https://lore.kernel.org/r/20240930043814.530181-2-padmarao.begari@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>