Fixed .gitignore to refer to gateware instead of firmware

.gitignore

@@ -1,37 +1,37 @@
 extdoc/
-firmware/build/
-firmware/csr.json
-firmware/litex_json2dts_zephyr.py
-firmware/overlay.config
-firmware/overlay.cmake
-firmware/overlay.dts
-firmware/pin_io.c
+gateware/build/
+gateware/csr.json
+gateware/litex_json2dts_zephyr.py
+gateware/overlay.config
+gateware/overlay.cmake
+gateware/overlay.dts
+gateware/pin_io.c
 misc/
 software/build/
 *.fst
 obj_dir
 *.fst.hier
 *.swp
-firmware/rtl/control_loop/control_loop_cmds.h
-firmware/rtl/raster/ram_shim_cmds.h
-firmware/rtl/raster/raster_cmds.h
-firmware/rtl/base/base.v
-firmware/rtl/control_loop/control_loop.v
-firmware/rtl/control_loop/control_loop_cmds.vh
-firmware/rtl/control_loop/control_loop_math.v
+gateware/rtl/control_loop/control_loop_cmds.h
+gateware/rtl/raster/ram_shim_cmds.h
+gateware/rtl/raster/raster_cmds.h
+gateware/rtl/base/base.v
+gateware/rtl/control_loop/control_loop.v
+gateware/rtl/control_loop/control_loop_cmds.vh
+gateware/rtl/control_loop/control_loop_math.v
 *_preprocessed.v
-firmware/csr.repl
-firmware/csr.resc
-firmware/rtl/control_loop/slpp_all/
-firmware/rtl/raster/.f4cache
-firmware/rtl/raster/build/
-firmware/rtl/raster/pack.log
-firmware/rtl/raster/place.log
-firmware/rtl/raster/route.log
-firmware/rtl/raster/synth.log
-firmware/rtl/raster/synth_test_yosys.v
-firmware/rtl/raster/yosys_output
-firmware/csr_bitwidth.json
+gateware/csr.repl
+gateware/csr.resc
+gateware/rtl/control_loop/slpp_all/
+gateware/rtl/raster/.f4cache
+gateware/rtl/raster/build/
+gateware/rtl/raster/pack.log
+gateware/rtl/raster/place.log
+gateware/rtl/raster/route.log
+gateware/rtl/raster/synth.log
+gateware/rtl/raster/synth_test_yosys.v
+gateware/rtl/raster/yosys_output
+gateware/csr_bitwidth.json
 boot/*
 !boot/boot.json
 build/buildroot.tar.gz