ioctl: Use asm-generic/ioctls.h on arm (enables termiox)

This patch converts arm to use asm-generic/ioctls.h instead of its
own version.

The differences between the arch-specific version and the generic
version are as follows:

- ARM defines its own value for FIOQSIZE, asm-generic/ioctls.h keeps it
- The generic version adds support for termiox

Reviewed-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>