media: drx-k: remove unused MulDiv32 function

This function has never been used. Found with clang:

drivers/media/dvb-frontends/drxk_hard.c:159:19: warning: unused function 'MulDiv32' [-Wunused-function]
static inline u32 MulDiv32(u32 a, u32 b, u32 c)
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/dvb-frontends/drxk_hard.c

@@ -155,17 +155,6 @@ if (debug >= level)							\
 	printk(KERN_DEBUG KBUILD_MODNAME ": %s " fmt, __func__, ##arg);	\
 } while (0)
 
-
-static inline u32 MulDiv32(u32 a, u32 b, u32 c)
-{
-	u64 tmp64;
-
-	tmp64 = (u64) a * (u64) b;
-	do_div(tmp64, c);
-
-	return (u32) tmp64;
-}
-
 static inline u32 Frac28a(u32 a, u32 c)
 {
 	int i = 0;