xilinx: zynqmp: fix ZYNQMP_RESTORE_JTAG check

Config check should be done without the SPL_ prefix.

Signed-off-by: Ricardo Salveti <ricardo@foundries.io>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@foundries.io>
Link: https://lore.kernel.org/r/20211104192802.3093811-1-ricardo@foundries.io


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