raw/ifpga: add APIs to get FPGA information

raw/ifpga: add APIs to get FPGA information

There are some information data can be got from FPGA, they are
implemented in below APIs:
1. rte_pmd_ifpga_get_property() get properties of FPGA (include BMC).
2. rte_pmd_ifpga_get_phy_info() get information of PHY connect to FPGA.
3. rte_pmd_ifpga_get_rsu_status() get status of rsu process.

Signed-off-by: Wei Huang <wei.huang@intel.com>
Acked-by: Tianfei Zhang <tianfei.zhang@intel.com>
Acked-by: Rosen Xu <rosen.xu@intel.com>