staging: comedi: s626: remove S626_BF_* macros

The `S626_BF_*` bitfield position macros are no longer used and are just
a subset of the corresponding `S626_STDBIT_*` bitfield position macros.
Remove them.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/s626.h

@@ -499,15 +499,6 @@
 #define S626_CLKMULT_2X		1	/* 2x clock multiplier. */
 #define S626_CLKMULT_1X		2	/* 1x clock multiplier. */
 
-/* Bit Field positions in COUNTER_SETUP structure: */
-#define S626_BF_LOADSRC		9	/* Preload trigger. */
-#define S626_BF_INDXSRC		7	/* Index source. */
-#define S626_BF_INDXPOL		6	/* Index polarity. */
-#define S626_BF_ENCMODE		4	/* Encoder mode. */
-#define S626_BF_CLKPOL		3	/* Clock polarity/count direction. */
-#define S626_BF_CLKMULT		1	/* Clock multiplier. */
-#define S626_BF_CLKENAB		0	/* Clock enable. */
-
 /* Enumerated counter clock multipliers. */
 
 #define S626_MULT_X0		0x0003	/* Supports no multipliers;