eos-s3/btn_counter/Makefile: cleanup

Signed-off-by: Unai Martinez-Corral <umartinezcorral@antmicro.com>

eos-s3/btn_counter/Makefile

@@ -1,14 +1,12 @@
-mkfile_path := $(abspath $(lastword $(MAKEFILE_LIST)))
-current_dir := $(patsubst %/,%,$(dir $(mkfile_path)))
-TOP:=top
-VERILOG:=btn_counter.v
-DEVICE := ql-eos-s3
-PARTNAME := PD64
-PCF:=chandalar.pcf
-
 ifdef F4PGA_USE_DEPRECATED
 all:
-	ql_symbiflow -compile -d ${DEVICE} -P ${PARTNAME} -v ${VERILOG} -t ${TOP} -p ${PCF}
+	ql_symbiflow \
+	  -compile \
+	  -d ql-eos-s3 \
+	  -P PD64 \
+	  -v btn_counter.v \
+	  -t top \
+	  -p chandalar.pcf
 else
 all:
 	f4pga -vvv build --flow ./flow.json