zynq: defconfig: Move CONFIG_OF_* to Kconfig

This commit moves:
- CONFIG_OF_CONTROL
- SPL_DISABLE_OF_CONTROL

from zynq_*_defconfig files into arch/arm/Kconfig "config ARCH_ZYNQ"

Signed-off-by: Jagan Teki <jteki@openedev.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>