WIP PPU LX/LY registers

Removed second reg16 read port - no longer needed.

build/tb_top.Makefile

@@ -1,7 +1,7 @@
 TB       = tb_top
 SOURCES  = gb.sv cpu.sv ppu.sv idec.sv ctrl.sv alu.sv alu16.sv regbank.sv rom.sv ram.sv cart.sv tb_top.sv clkgen.sv
 INCLUDES = cpu_pkg.svh sva_common.svh
-PATH_SRC = ../rtl:../rtl/cpu:../sim
+PATH_SRC = ../rtl:../rtl/cpu:../rtl/ppu:../sim
 
 DEFINES = SVA_ENABLE