Blackfin SPI Driver: use the properl BIT_CTL_xxx defines

use the properl BIT_CTL_...  defines rather than the internal driv er
CFG_SPI_...  defines

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>