arm64: xilinx: zynqmp: Remove unneeded configs

Remove unneeded configs from mini qspi configuration
so that it saves space for this mini configuration.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>