hw/audio/virtio-snd: Always use little endian audio format

hw/audio/virtio-snd: Always use little endian audio format

The VIRTIO Sound Device conforms with the Virtio spec v1.2,
thus only use little endianness.

Remove the suspicious target_words_bigendian() noticed during
code review.

Cc: qemu-stable@nongnu.org
Fixes: eb9ad377bb ("virtio-sound: handle control messages and streams")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20240422211830.25606-1-philmd@linaro.org>
(cherry picked from commit a276ec8e2632c9015d0f9b4e47194e4e91dfa8bb)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>