The Lattice code was missed by commit e6a857da "fpga: constify to fix
build warning" resulting in such warnings:

fpga.c: In function 'fpga_load':
fpga.c:238: warning: passing argument 2 of 'lattice_load' discards qualifiers from pointer target type
fpga.c: In function 'fpga_dump':
fpga.c:278: warning: passing argument 2 of 'lattice_dump' discards qualifiers from pointer target type

Signed-off-by: Wolfgang Denk <wd@denx.de>
cc: Stefano Babic <sbabic@denx.de>

Signed-off-by: Wolfgang Denk <wd@denx.de>

Add prototype function for ispVMFreeMem to remove warnings
when support for Lattice FPGA is compiled.

Signed-off-by: Stefano Babic <sbabic@denx.de>

The patch adds support to load a Lattice's bitstream
image (called VME file) into a Lattice FPGA. The code
containing the state machine delivered as part of
Lattice's ispVMtools is integrated.

The FPGA is programmed using the JTAG interface. The
board maintainer must provide accessors to drive the
JTAG signals TCK, TMS, TDI and to get the value of the
input signal TDO.

Signed-off-by: Stefano Babic <sbabic@denx.de>