Swap two arguments to resolve bug
**Related issue**: N/A
**Type of change**: bug fix
**Impact**: other
**Release Notes**
The string of path for "-ip-vivado-tcls" could be empty ("")
For example, run "make SUB_PROJECT=arty bitstream" will get errors due the argument parsing in [prologue.tcl](https://github.com/sifive/fpga-shells/blob/d4b3878e4f5cf5c4621dbfe9b0bda1ed0dd3b995/xilinx/common/tcl/prologue.tcl)
Swaping the two arguments can resolve bug.
@@ -118,8 +118,8 @@ $(BIT_FILE): $(synth_list_f)
-tclargs \
-top-module "$(MODEL)" \
-F "$(synth_list_f)" \
- -ip-vivado-tcls "$(shell find '$(build_dir)' -name '*.vivado.tcl')" \
- -board "$(BOARD)"
+ -board "$(BOARD)" \
+ -ip-vivado-tcls "$(shell find '$(build_dir)' -name '*.vivado.tcl')"
.PHONY: bitstream
bitstream: $(BIT_FILE)
