soc/intel/quark: Add PCIe reset support

Migrate PCIe reset from PlatformPciHelperLib in QuarkFspPkg into
coreboot.

Change-Id: I1c33fa16b0323091e8f9bd503bbfdb8a253a76d4
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14944
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
10 files changed