ASoC: Intel: remove duplicate headers

A few files contain duplicate headers. This patch removes the second entry of
duplicate in each file under question.

There is no functional changes.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Cc: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/intel/sst-haswell-ipc.c

@@ -25,7 +25,6 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
-#include <linux/list.h>
 #include <linux/platform_device.h>
 #include <linux/kthread.h>
 #include <linux/firmware.h>