Previously on Altera, we used a generic to preload the firmware for WR.
This patch removes this as we can now preload with mif which compiles in
seconds instead of hours (quartus does not handle large generics well).

ISE doesn't support type definitions in expressions.
It doesn't like aliases of variables either.

Many of our platforms have an optional WhiteRabbit addon board.
The Wishbone bus should continue to operate in this case.
Thus the system clock is derived from the local oscillator, and
the white rabbit reference clock is an independent PLL.

I'm not sure where else to put this code at the moment.

Conflicts:
	modules/wrc_core/wr_core.vhd