ASoC: rt1015: clarify expression

cppcheck warning:

sound/soc/codecs/rt1015.c:894:61: style: Boolean result is used in
bitwise operation. Clarify expression with
parentheses. [clarifyCondition]
  (pll_code.m_bp ? 0 : pll_code.m_code) << RT1015_PLL_M_SFT |
                                                            ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302212527.55158-5-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>