mcap: Add MCAP Linux Library

    The MCAP interface enables an embedded microprocessor, such as MicroBlaze,
    to read and write the FPGA configuration memory.
    This library allows user to access the MCAP i/f.

Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>