platform/x86: intel_pmc_ipc: Use MFD framework to create dependent devices

platform/x86: intel_pmc_ipc: Use MFD framework to create dependent devices

Currently, we have lot of repetitive code in dependent device resource
allocation and device creation handling code. This logic can be improved if
we use MFD framework for dependent device creation. This patch adds this
support.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>