raw/ifpga/base: fix NIOS SPI init

raw/ifpga/base: fix NIOS SPI init

Add fecmode setting on NIOS SPI primary initialization.
this SPI is shared by NIOS core inside FPGA, NIOS will
use this SPI primary to do some one-time initialization
after power up, and then release the control to DPDK.

Fix the timeout initialization for polling the
NIOS_INIT_DONE.

Fixes: bc44402f ("raw/ifpga/base: configure FEC mode")
Cc: stable@dpdk.org
Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
Acked-by: Rosen Xu <rosen.xu@intel.com>