staging:iio:ad2s1210: Remove unused #define directive

This patch removes some #define directives not used in the code.
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/resolver/ad2s1210.c

@@ -35,8 +35,6 @@
 #define AD2S1210_SET_RES1		0x02
 #define AD2S1210_SET_RES0		0x01
 
-#define AD2S1210_SET_ENRESOLUTION	(AD2S1210_SET_ENRES1 |	\
-					 AD2S1210_SET_ENRES0)
 #define AD2S1210_SET_RESOLUTION		(AD2S1210_SET_RES1 | AD2S1210_SET_RES0)
 
 #define AD2S1210_REG_POSITION		0x80
@@ -53,10 +51,6 @@
 #define AD2S1210_REG_SOFT_RESET		0xF0
 #define AD2S1210_REG_FAULT		0xFF
 
-/* pin SAMPLE, A0, A1, RES0, RES1, is controlled by driver */
-#define AD2S1210_SAA		3
-#define AD2S1210_PN		(AD2S1210_SAA + AD2S1210_RES)
-
 #define AD2S1210_MIN_CLKIN	6144000
 #define AD2S1210_MAX_CLKIN	10240000
 #define AD2S1210_MIN_EXCIT	2000
@@ -64,10 +58,6 @@
 #define AD2S1210_MIN_FCW	0x4
 #define AD2S1210_MAX_FCW	0x50
 
-/* default input clock on serial interface */
-#define AD2S1210_DEF_CLKIN	8192000
-/* clock period in nano second */
-#define AD2S1210_DEF_TCK	(1000000000 / AD2S1210_DEF_CLKIN)
 #define AD2S1210_DEF_EXCIT	10000
 
 enum ad2s1210_mode {