Drivers: hv: ring_buffer: remove stray smp_read_barrier_depends()

Drivers: hv: ring_buffer: remove stray smp_read_barrier_depends()

smp_read_barrier_depends() does nothing on almost all arcitectures
including x86 and having it in the beginning of
hv_get_ringbuffer_availbytes() does not provide any guarantees anyway.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 45870a441361d1c05a5f767c4ece2f6e30e0da9c)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>