uboot-phytec

fpga: zynq: Add delay after PCFG_PROG_B change

There is delay needed after PCFG_PROGB change if
AES key source is efuse. This fixes the issue of
encrypted bitstream loading with AES efuse as key
source.

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