compat_ioctl: remove HCIUART handling

As of commit f0193d3e ("change semantics of ldisc ->compat_ioctl()"),
all hciuart ioctl commands are handled correctly in the driver, and we
never need to go through the table here.

Cc: linux-bluetooth@vger.kernel.org
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>