Fix plru_tb to use the new plrufn and take out the old plru.vhdl

This reworks (and simplifies) plru_tb to use the new plrufn module
instead of the old (and now unused) plru module.

The latter is now removed completely.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Makefile

@@ -68,7 +68,7 @@ all: $(all)
 $(shell scripts/make_version.sh git.vhdl)
 
 core_files = decode_types.vhdl common.vhdl wishbone_types.vhdl fetch1.vhdl \
-	utils.vhdl plru.vhdl plrufn.vhdl cache_ram.vhdl icache.vhdl \
+	utils.vhdl plrufn.vhdl cache_ram.vhdl icache.vhdl \
 	predecode.vhdl decode1.vhdl helpers.vhdl insn_helpers.vhdl \
 	control.vhdl decode2.vhdl register_file.vhdl \
 	cr_file.vhdl crhelpers.vhdl ppc_fx_insns.vhdl rotator.vhdl \