platform/x86: intel_pmc_ipc: Get rid of unnecessary includes

There is no point including headers that are not needed in the driver so
drop them.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>