fpga: Spartan-3: let print the progress if configured

CONFIG_SYS_FPGA_PROG_FEEDBACK was already introduced to print
the current status of FPGA loading - an undef in the code made this
CONFIG_ useless.

Signed-off-by: Stefano Babic <sbabic@denx.de>

drivers/fpga/spartan3.c

@@ -38,7 +38,6 @@
 #endif
 
 #undef CONFIG_SYS_FPGA_CHECK_BUSY
-#undef CONFIG_SYS_FPGA_PROG_FEEDBACK
 
 /* Note: The assumption is that we cannot possibly run fast enough to
  * overrun the device (the Slave Parallel mode can free run at 50MHz).