btrfs-progs: use linux mount.h instead of sys/mount.h

This file includes linux/fs.h which includes linux/mount.h and with
glibc 2.36 linux/mount.h and glibc mount.h are not compatible [1]
therefore try to avoid including both headers

[1] https://sourceware.org/glibc/wiki/Release/2.36

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>

common/device-utils.c

@@ -15,7 +15,6 @@
  */
 
 #include <sys/ioctl.h>
-#include <sys/mount.h>
 #include <sys/statfs.h>
 #include <sys/types.h>
 #include <stdio.h>