soc/intel/skylake: Clean up the skylake PCH H device ID macros

Rename the device ID macros as per the skylake PCH H external design
specification.

Change-Id: I4e80d41380dc1973d02bc69ac32aad5c4741a976
Signed-off-by: V Sowmya <v.sowmya@intel.com>
Reviewed-on: https://review.coreboot.org/23381
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
6 files changed