[Blackfin] arch: fix bug: redefinition warning when compile EZKIT548

#define                 DMA_READY  0x1        /* DMA Ready */

#define                  FIFOFULL  0x2        /* FIFO Full */

#define                 FIFOEMPTY  0x4        /* FIFO Empty */

#define                  COMPLETE  0x8        /* DMA Complete */

#define              DMA_COMPLETE  0x8        /* DMA Complete */

#define                      HSHK  0x10       /* Host Handshake */

#define                   TIMEOUT  0x20       /* Host Timeout */

#define                 HSTIMEOUT  0x20       /* Host Timeout */

#define                      HIRQ  0x40       /* Host Interrupt Request */

#define                ALLOW_CNFG  0x80       /* Allow New Configuration */

#define                   DMA_DIR  0x100      /* DMA Direction */