ASoC: SOF: ipc: clarify operator precedence

Cppcheck complains about the following warning, fix by adding
parentheses

[sound/soc/sof/ipc.c:783]:
(style) Clarify calculation precedence for '&' and '?'.
[sound/soc/sof/ipc.c:785]:
(style) Clarify calculation precedence for '&' and '?'.
[sound/soc/sof/ipc.c:787]:
(style) Clarify calculation precedence for '&' and '?'.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>