Blackfin arch: Fix Warning add some defines in BF54x header file

#define                  FIFO_RWM  0x18000000 /* FIFO Regular Watermarks */

#define                  FIFO_UWM  0x60000000 /* FIFO Urgent Watermarks */

#define DLEN_8		(0 << 15) /* 000 - 8 bits */

#define DLEN_10		(1 << 15) /* 001 - 10 bits */

#define DLEN_12		(2 << 15) /* 010 - 12 bits */

#define DLEN_14		(3 << 15) /* 011 - 14 bits */

#define DLEN_16		(4 << 15) /* 100 - 16 bits */

#define DLEN_18		(5 << 15) /* 101 - 18 bits */

#define DLEN_24		(6 << 15) /* 110 - 24 bits */

/* Bit masks for EPPIx_FS2W_LVB */

#define                   F1VB_BD  0xff       /* Vertical Blanking before Field 1 Active Data */