The audio related clock support is missing from the existing zx296718
clock driver.  Let's add it, so that the upstream ZX SPDIF driver can
work for HDMI audio support.
Signed-off-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>
[sboyd@codeaurora.org: Staticize some more structures]
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>