Enhance status print while programming the FPGA

Flush the print buffer to instantly print "Connecting and loading FPGA..."
Without "flush = True" this message is only printed after the next print
statement, which is after the FPGA is programmed.

Signed-off-by: Michael Tempelmeier <michael.tempelmeier@gi-de.com>

Author: m-temp

cw/util/device.py

@@ -76,7 +76,7 @@ def initialize_fpga(self, fpga, bitstream, pll_frequency):
         # bitstream.
         # TODO: We should have this in the CLI.
         force_programming = False
-        print('Connecting and loading FPGA... ', end='')
+        print('Connecting and loading FPGA... ', end='', flush = True)
 
         # Runtime patch fpga.fpga.FPGAProgram to detect if it was actually called.
         # Note: This is fragile and may break but it is easy to miss that the FPGA