Remove the unnecessary math.h inclusion

or move from header file to source file since math.h doesn't always exist

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

drivers/audio/cs4344.c

@@ -46,7 +46,6 @@
 #include <nuttx/audio/i2s.h>
 #include <nuttx/audio/audio.h>
 #include <nuttx/audio/cs4344.h>
-#include <nuttx/lib/math.h>
 
 #include "cs4344.h"
 

drivers/audio/cs43l22.c

@@ -43,7 +43,6 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 
-#include <math.h>
 #include <inttypes.h>
 #include <stdint.h>
 #include <stdio.h>

drivers/audio/cxd56_src.c

@@ -24,7 +24,6 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <math.h>
 #include <queue.h>
 #include <stdio.h>
 #include <string.h>

drivers/audio/vs1053.c

@@ -27,7 +27,6 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 
-#include <math.h>
 #include <inttypes.h>
 #include <stdint.h>
 #include <stdbool.h>

drivers/audio/wm8904.c

@@ -32,7 +32,6 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 
-#include <math.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <inttypes.h>

drivers/audio/wm8994.c

@@ -48,7 +48,6 @@
 #include <nuttx/audio/i2s.h>
 #include <nuttx/audio/audio.h>
 #include <nuttx/audio/wm8994.h>
-#include <nuttx/lib/math.h>
 
 #include "wm8994.h"