gen83xx warning for macros redefined

[Joel Sherrill]

log/powerpc-hsc_cm01.log:/home/joel/rtems-work/rtems-testing/rtems/rtems/bsps/powerpc/gen83xx/include/bsp/hwreg_vals.h:244:0: warning: "FPGA_START" redefined
log/powerpc-hsc_cm01.log:/home/joel/rtems-work/rtems-testing/rtems/rtems/bsps/powerpc/gen83xx/include/bsp/hwreg_vals.h:246:0: warning: "FPGA_SIZE" redefined

Looking at the code, it is pretty clear that the macros are redefined. Unfortunately one of the three has a different value the second time:

========================================
/* fpga BCSR register */
#define FPGA_START 0xF8000000
#define FPGA_SIZE 0x8000
#define FPGA_END (FPGA_START+FPGA_SIZE-1)

/*

• working values for various registers, used in start/start.S */

/* fpga config 16 MB size */
#define FPGA_CONFIG_START 0xF8000000
#define FPGA_CONFIG_SIZE 0x01000000
/* fpga register 8 MB size */
#define FPGA_REGISTER_START 0xF9000000
#define FPGA_REGISTER_SIZE 0x00800000
/* fpga fifo 8 MB size */
#define FPGA_FIFO_START 0xF9800000
#define FPGA_FIFO_SIZE 0x00800000

#define FPGA_START (FPGA_CONFIG_START)
fpga window size 32 MByte
#define FPGA_SIZE (0x02000000)
#define FPGA_END (FPGA_START+FPGA_SIZE-1)

========================================

[Sebastian Huber <sebastian.huber@…>]

In 9b61342/rtems:

bsp/gen83xx: Fix define redefinitions

Close #3340.