media: dvb-frontends: drx39xyj: remove obsolete sign extend macros

DRX_S9TOS16 and DRX_S24TODRXFREQ are simply not used. Furthermore,
sign_extend32() should be used for sign extension. (Also, the comment
describing DRX_S24TODRXFREQ was wrong). So remove these macros.
Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/drx39xyj/drx_driver.h

@@ -449,19 +449,6 @@ MACROS
 #define DRX_16TO8(x) ((u8) (((u16)x) & 0xFF)), \
 			((u8)((((u16)x)>>8)&0xFF))
 
-/**
-* \brief Macro to sign extend signed 9 bit value to signed  16 bit value
-*/
-#define DRX_S9TOS16(x) ((((u16)x)&0x100) ? ((s16)((u16)(x)|0xFF00)) : (x))
-
-/**
-* \brief Macro to sign extend signed 9 bit value to signed  16 bit value
-*/
-#define DRX_S24TODRXFREQ(x) ((((u32) x) & 0x00800000UL) ? \
-				 ((s32) \
-				    (((u32) x) | 0xFF000000)) : \
-				 ((s32) x))
-
 /**
 * \brief Macro to convert 16 bit register value to a s32
 */