Revert "ARM: zynq defconfig: Enable debug options"

This reverts commit e8a0f03e48a0b28fb2d8137745bc7dd9da61d724.

Disable debug feature for this defconfig.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Tested-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>