ASoC: Intel: Correct a macro for FW message

For the broadwell official released FW(Since 8.4.1.43), the macro
SST_HSW_NO_CHANNELS is changed and fixed to 4, so here change it
to 4.

Signed-off-by: Jie Yang <yang.jie@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>